5 Common Symptoms of Raynaud’s Syndrome You Should Never Overlook

Raynaud’s Syndrome, though often overlooked, affects up to 5% of the population, yet many people remain unaware of the signs until it becomes more severe. This disorder causes the blood vessels, particularly in the fingers and toes, to narrow in response to cold or stress.

When this happens, blood flow is restricted, leading to numbness, color changes, and, in some cases, more serious complications. So, how can you identify this condition before it gets worse?

While the most common symptom – skin turning white or blue in response to cold – might seem obvious, the reality is that many early signs are subtler. In fact, studies show that nearly 40% of individuals with Raynaud’s don’t recognize the condition until it becomes more pronounced.

The symptoms can be so mild that they’re easily mistaken for just the usual cold hands or stress-induced reactions. But Raynaud’s is more than that, it’s a serious condition that requires attention.

In fact, research reveals that people who ignore these early warning signs may experience more frequent and severe episodes, with up to 10% of sufferers developing long-term damage to the blood vessels in the hands and feet.

So, it’s crucial to pay attention to the smaller signs early on. Persistent numbness, tingling, or skin color changes after exposure to cold or stress are all key indicators that you should never overlook.

With approximately 10% of cases progressing to more serious complications, it’s essential to recognize the warning signs before it’s too late.

By understanding the top five common symptoms of Raynaud’s Syndrome, you can take steps toward managing the condition and avoiding long-term health issues. Let’s dive into the five critical symptoms you need to be aware of, so you can stay ahead of Raynaud’s and protect your well-being.

What is Raynaud’s Syndrome?

Raynaud’s syndrome is a vasospastic disorder characterized by intermittent episodes of reduced blood flow to the extremities, primarily the fingers and toes, which is typically triggered by exposure to cold temperatures or emotional stress.

This condition is defined by an exaggerated vascular response where the small arteries (arterioles) supplying blood to the skin go into spasm, a process known as vasospasm, leading to a temporary but dramatic decrease in circulation.

Raynaud’s syndrome most commonly affects the distal extremities, with the fingers and toes being the primary sites of symptoms, but it can also impact other peripheral parts of the body such as the nose, ears, lips, and even the nipples.

The underlying mechanism is consistent across all affected areas: the small blood vessels that supply these regions are hypersensitive to triggers like cold and stress, leading them to constrict excessively and restrict blood flow.

More specifically, fingers and toes are the most classic and frequently affected areas. Typically, not all fingers or toes are affected at once, and the attack may be asymmetrical, impacting one hand more than the other. The thumbs are often spared, a clinical clue that can sometimes help in diagnosis. During an attack, the digits will undergo the characteristic color changes and feel cold and numb.

Though less common, vasospasm can occur in nose, ears, and lips. When the nose or earlobes are affected, they can turn starkly white and feel numb, which can be particularly uncomfortable and noticeable. The lips may also become pale or bluish. These occurrences are often triggered by exposure to cold wind or significant drops in ambient temperature.

Also, raynaud’s of the nipple is a recognized phenomenon, particularly in breastfeeding mothers. The vasospasm can cause severe, throbbing pain during or after breastfeeding as the nipple turns white and then may cycle through blue and red.

This specific manifestation can be intensely painful and is often misdiagnosed as a yeast infection or improper latch, highlighting the importance of awareness of Raynaud’s in different body parts.

Regardless of the location, the physiological process remains the same. The hypersensitive smooth muscles in the walls of the arterioles contract powerfully, narrowing the vessel’s diameter and creating a temporary blockage of blood flow, leading to the tell-tale symptoms of Raynaud’s.

Is Raynaud’s Syndrome a Serious Condition?

For the vast majority of individuals who have Primary Raynaud’s, the condition is not medically serious and is considered a manageable nuisance; however, Secondary Raynaud’s can be a sign of a more serious underlying autoimmune or connective tissue disease that requires medical management.

Primary Raynaud’s (Raynaud’s disease) is the most common form of the condition, accounting for an estimated 80-90% of all cases. It is termed “primary” because it occurs in isolation, without any associated underlying medical condition. Symptoms typically appear at a younger age, often in the teenage years or early twenties, and are generally milder.

While the attacks can be uncomfortable and inconvenient, Primary Raynaud’s very rarely leads to tissue damage, such as skin ulcers or gangrene. It is considered a benign condition that primarily affects quality of life but does not threaten overall health or longevity.

Secondary Raynaud’s (Raynaud’s phenomenon) is less common but potentially more serious because it is caused by an underlying disease, condition, or external factor. It is called secondary as the Raynaud’s symptoms are a consequence of another problem.

Associated conditions often include autoimmune or connective tissue diseases like scleroderma, lupus, rheumatoid arthritis, and Sjögren’s syndrome. Other causes can include arterial diseases, carpal tunnel syndrome, certain medications (like beta-blockers or some cancer drugs), and occupational exposures to vibration.

Symptoms of Secondary Raynaud’s tend to be more severe, can appear later in life (typically after age 40), and may involve more intense pain. Crucially, because the underlying disease can damage blood vessels, there is a higher risk of complications, including painful digital ulcers and, in rare, severe cases, gangrene.

Therefore, anyone experiencing symptoms of Raynaud’s should seek a medical evaluation. A physician can perform tests and review the clinical picture to distinguish between primary and secondary forms, ensuring that if an underlying condition is present, it is diagnosed and treated appropriately.

5 Key Symptoms of Raynaud’s Syndrome

Characteristic Color Changes of a Raynaud’s Attack

The characteristic color changes of a Raynaud’s attack follow a classic tri-phasic pattern: the affected area first turns a stark white (pallor) due to vasospasm cutting off blood flow, then it may turn blue (cyanosis) as the trapped blood deoxygenates, and finally, it flushes bright red (rubor) as blood flow is restored.

While this white-blue-red sequence is considered classic, it’s important to note that not every individual will experience all three phases during every attack. Each phase has a distinct physiological cause and associated sensations.

In phase 1 – white (pallor), this initial phase is triggered by the sudden, intense constriction of the small arteries (vasospasm). This constriction effectively acts as a temporary clamp, stopping blood from reaching the capillaries in the skin.

The lack of blood drains the color from the area, leaving it looking waxy, pale, or ghostly white. A clear line of demarcation is often visible between the affected and unaffected skin. During this phase, the digit or area will feel cold to the touch and profoundly numb.

In phase 2 – blue (cyanosis), if the vasospasm persists, the small amount of blood that remains trapped in the tissues begins to lose its oxygen. Deoxygenated blood is darker and appears blue when viewed through the skin.

This phase is known as cyanosis. The affected area will remain cold and numb, and the blue color can be quite alarming to witness. Some individuals may skip this phase entirely or it may be very brief.

In phase 3 – red (rubor), this final phase occurs when the vasospasm resolves and the blood vessels dilate, allowing blood to rush back into the deprived tissues. This sudden return of circulation is called reactive hyperemia. The influx of warm, oxygenated blood causes the skin to flush a bright, sometimes blotchy, red.

This rewarming phase is often the most uncomfortable part of the attack, frequently accompanied by throbbing, tingling, stinging pain, and a sensation of swelling. The attack is considered over once the normal skin color and sensation have returned.

Numbness or A ‘pins and needles’ Sensation

The numbness or ‘pins and needles’ sensation in Raynaud’s feels very much like a part of the body has fallen asleep, characterized by a significant loss of sensation, a cold and waxy feeling, and a subsequent prickly or tingling feeling as circulation begins to return.

This symptom, known medically as paresthesia, is a direct result of the nerve endings being deprived of their normal blood supply and oxygen during the white and blue phases of an attack.

For example, when the fingers are in the white (pallor) phase, the numbness can be so profound that the individual may not be able to feel light touch or even a pinprick. The fingers can feel stiff and wooden, almost like they belong to someone else. This lack of sensory feedback is a primary reason for the loss of dexterity and fine motor control.

As the attack progresses or begins to resolve, the sensation often transitions from complete numbness to the classic “pins and needles” feeling. This tingling is a sign that the nerves are starting to wake up as blood flow is slowly restored, similar to the sensation experienced when a compressed limb regains circulation.

This prickly feeling often precedes the more intense throbbing pain associated with the final red (rubor) phase. The combination of coldness and numbness makes the affected area feel particularly vulnerable and clumsy, making simple tasks feel monumental.

Pain or Throbbing

Pain or throbbing is a very common and often distressing symptom of Raynaud’s, which typically occurs during the rewarming or reperfusion (red) phase of an attack as blood flow rushes back into the oxygen-deprived tissues.

This experience, often described as a throbbing, stinging, burning, or aching sensation, is the body’s reaction to the sudden return of circulation after a period of ischemia.

The nature and intensity of this pain can vary significantly from person to person and from one attack to another. For some, it may be a mild, tingling discomfort that is easily tolerated. For others, the pain can be severe and debilitating, feeling like intense pins and needles or a deep, burning ache.

This pain is the direct opposite of the profound numbness experienced in the initial phases of the attack. While the white and blue phases are characterized by a lack of feeling, the red phase is defined by an overabundance of sensation as the nerves and tissues react to the influx of blood.

This phenomenon is known as reperfusion injury, where the restoration of circulation itself can cause oxidative stress and an inflammatory response in the tissues, contributing to the painful sensations.

The severity of the pain often correlates with the duration and severity of the vasospasm; longer and more complete interruptions of blood flow tend to result in a more painful rewarming phase.

Swelling In the Fingers and Toes

Raynaud’s can cause noticeable but temporary swelling in the fingers and toes, a symptom that typically manifests during the final, red (rubor) phase of an attack.

This swelling, or edema, occurs as the rapid and forceful return of blood flow (reactive hyperemia) into the constricted vessels can cause fluid to leak into the surrounding tissues, leading to a feeling of fullness and visible puffiness.

As the arterioles that were previously in spasm suddenly dilate, blood floods back into the capillary beds. This surge in pressure can overwhelm the small vessels, causing them to become temporarily more permeable. As a result, plasma fluid can seep out of the capillaries and into the interstitial space of the digit, causing it to swell.

Individuals often describe this sensation as their fingers feeling tight, sausage-like, or as if their rings have suddenly become too small. This swelling is almost always transient and resolves on its own as the circulatory system stabilizes and the excess fluid is reabsorbed.

While it can add to the overall discomfort of the rewarming period, alongside the throbbing pain and tingling, it is not typically a sign of permanent damage in Primary Raynaud’s. The sensation of swelling further contributes to the feeling of clumsiness and reduced dexterity until the attack has fully subsided.

Impairing Fine Motor Skills

Raynaud’s significantly impairs fine motor skills during an attack by creating a combination of profound numbness, cold-induced stiffness, and loss of tactile sensation in the fingers, making simple and precise movements extremely difficult or impossible to perform.

The functional disability caused by an attack is one of the most frustrating aspects of the condition for many individuals.

The impairment is a direct result of the key symptoms. The numbness that occurs during the white and blue phases means the brain receives no sensory feedback from the fingertips, making it impossible to gauge pressure or feel the texture of objects.

Trying to button a shirt, for example, becomes a clumsy struggle because one cannot feel the button or the buttonhole. The coldness of the digits causes the muscles and joints to become stiff and less pliable, reducing their range of motion and speed.

Tasks requiring dexterity, such as typing on a keyboard, using a smartphone, writing with a pen, or handling small objects like keys or coins, become slow, inaccurate, and frustrating.

The combination of not being able to feel what you are doing and having stiff, unresponsive fingers leads to a complete breakdown of fine motor coordination. This temporary loss of function can be particularly problematic in certain professions or daily activities, underscoring the impact of Raynaud’s beyond simple discomfort.

What are the Common Triggers for Raynaud’s Syndrome?

Exposure to Cold Temperatures

Exposure to cold temperatures triggers a Raynaud’s attack by causing an exaggerated and overactive vasoconstriction response, where the small arteries that supply blood to the skin narrow far more dramatically than they would in a person without the condition, severely limiting or even halting blood flow.

This is a hyper-reaction of the body’s normal physiological mechanism for conserving core body heat in a cold environment.

For example, a person’s body naturally responds to cold by constricting peripheral blood vessels to reduce heat loss from the skin’s surface and redirect blood flow to vital internal organs. In individuals with Raynaud’s, this protective response is in overdrive.

The muscles in the walls of the arterioles in their fingers and toes are hypersensitive to cold stimuli. This means that a trigger does not have to be an extreme, freezing temperature. For many, even a minor drop in temperature can be sufficient to provoke a full-blown attack.

Common examples of cold triggers include: walking into an air-conditioned grocery store or office, reaching into a refrigerator or freezer case to retrieve an item, holding a cold beverage can or glass, washing hands with cool water, being outside on a cool, windy day, even if the temperature is not freezing.

The response is often rapid, with the color and sensation changes beginning within minutes of the cold exposure. This hypersensitivity is why preventative measures, such as wearing warm gloves and socks, dressing in layers, and avoiding direct contact with cold objects, are the cornerstone of managing Raynaud’s.

Emotional Stress or Anxiety

Emotional stress or anxiety can absolutely cause Raynaud’s symptoms by activating the body’s sympathetic nervous system, also known as the fight-or-flight response, which causes the release of stress hormones like adrenaline (epinephrine) that directly trigger the constriction of peripheral blood vessels.

This means a Raynaud’s attack can occur without any change in the external temperature, being initiated purely by a person’s psychological or emotional state.

When a person experiences stress, anxiety, excitement, or even a sudden shock, their brain signals the adrenal glands to release adrenaline and noradrenaline. These hormones prepare the body for a perceived threat.

One of their primary functions is to divert blood flow away from non-essential areas, like the skin and extremities, and toward the major muscle groups, heart, and brain. For an individual with Raynaud’s, this hormonally-driven vasoconstriction is just as powerful a trigger as cold exposure.

The blood vessels in their fingers and toes will spasm and clamp down in the exact same way, initiating the characteristic sequence of color changes, numbness, and pain. Examples of emotional triggers can include public speaking, taking an exam, having a difficult conversation or argument, or even experiencing a moment of intense excitement or surprise.

This connection underscores the importance of stress management techniques such as deep breathing exercises, mindfulness, meditation, and biofeedback as part of a comprehensive strategy to control Raynaud’s symptoms.

By learning to manage the body’s response to stress, individuals can reduce the frequency of emotionally-triggered attacks.

Different Types of Raynaud’s

Raynaud’s is categorized into two main types, Primary and Secondary, which are distinguished by their underlying cause and are diagnosed through a combination of patient history, physical examination, and specific laboratory tests.

The fundamental distinction between Primary Raynaud’s and Secondary Raynaud’s lies in their origin and associated health implications.

Primary Raynaud’s, also known as Raynaud’s disease, is the more common and generally milder form of the condition. It occurs in isolation, without any underlying medical disease to explain the vasospastic attacks.

It typically begins between the ages of 15 and 30, affects women more frequently than men, and often has a familial link.For individuals with Primary Raynaud’s, the symptoms, while uncomfortable, rarely lead to significant tissue damage or serious complications.

In contrast, Secondary Raynaud’s, also referred to as Raynaud’s phenomenon, is caused by an underlying problem. This form is often more severe and can be linked to a range of conditions.

The most common causes are connective tissue diseases such as scleroderma, lupus (systemic lupus erythematosus), and rheumatoid arthritis.

Other causes can include arterial diseases like atherosclerosis, carpal tunnel syndrome, repetitive occupational stress (such as from using vibrating tools), smoking, certain medications (like beta-blockers or some chemotherapy agents), and injuries.

Secondary Raynaud’s tends to appear later in life, typically after age 40, and carries a higher risk of complications like skin ulcers or, in very rare cases, gangrene.

Raynaud’s Syndrome Diagnosis

Diagnosing Raynaud’s syndrome involves a multi-step process designed to confirm the condition and, crucially, to differentiate between its primary and secondary forms.

The initial step is a thorough review of the patient’s medical history and a detailed discussion of their symptoms. A physician will ask about the triggers for the attacks (such as cold exposure or emotional stress), the specific sequence of color changes in the digits, and any associated sensations like pain, numbness, or tingling.

A physical examination of the fingers and toes helps assess circulation and nerve function. To distinguish between primary and secondary types, specific tests are often employed.

A key diagnostic tool is the nailfold capillaroscopy. During this non-invasive test, a drop of oil is placed at the base of the fingernail, and the area is examined under a microscope.

In individuals with Secondary Raynaud’s related to a connective tissue disease, the capillaries may appear enlarged, misshapen, or distorted. In Primary Raynaud’s, these capillaries typically look normal.

Blood tests are also essential for identifying an underlying cause. Tests like the antinuclear antibody (ANA) test can detect autoantibodies often present in autoimmune diseases, while the erythrocyte sedimentation rate (ESR) can indicate systemic inflammation, both of which would point towards a diagnosis of Secondary Raynaud’s.

Complication of Raynaud’s Syndrome

While the majority of individuals with Raynaud’s, particularly the primary form, will not experience severe health issues, the condition can lead to rare but serious complications in some cases.

These complications are almost exclusively associated with severe Secondary Raynaud’s, where the underlying disease contributes to more intense and prolonged episodes of vasospasm, significantly restricting blood flow for extended periods. When the blood supply to the extremities is critically reduced, the tissue can become damaged.

The most common of these serious complications is the development of digital ulcers, which are painful, slow-healing sores that form on the tips of the fingers or toes. These ulcers are not only distressing but can also become infected, requiring careful medical management.

In the most extreme and very rare instances, a complete and sustained lack of blood flow can lead to gangrene, which is the death of tissue. This critical condition may necessitate the surgical removal (amputation) of the affected finger or toe to prevent the spread of infection and further damage.

Another potential complication seen in some forms of Secondary Raynaud’s, especially those linked to scleroderma, is sclerodactyly, a condition where the skin on the fingers becomes hard, tight, and shiny, restricting movement.

Raynaud’s and Other Circulatory Conditions like Acrocyanosis

Differentiating Raynaud’s syndrome from other peripheral vascular conditions like Acrocyanosis is essential for accurate diagnosis, as their management and prognosis differ significantly.

The key distinction lies in the nature and pattern of the symptoms. Raynaud’s is characterized by episodic attacks, which are transient and clearly triggered by cold or emotional stress.

During an attack, the affected digits typically undergo a classic triphasic color change: turning white (pallor) due to a lack of blood flow, then blue (cyanosis) as the vessels dilate and fill with deoxygenated blood, and finally red (rubor) as blood flow returns. These episodes are often accompanied by distinct sensations like numbness, tingling, or throbbing pain.

In contrast, Acrocyanosis is a persistent and generally painless condition. It involves a continuous, symmetric bluish discoloration of the hands and, less commonly, the feet.

The skin in the affected areas often feels cold and may be clammy or sweaty. While the blue color can worsen with cold exposure, it does not resolve into the distinct phases seen in Raynaud’s and remains relatively constant.

Unlike Raynaud’s, Acrocyanosis is not associated with the sharp demarcation of color changes or the painful rewarming phase and is rarely linked to underlying systemic diseases or serious complications like tissue damage.

FAQs

1. What foods should you avoid with Raynaud’s syndrome?

Individuals with Raynaud’s syndrome should avoid foods that can constrict blood vessels or trigger vasospasms, which reduce blood flow to the extremities.

Foods like caffeine, found in coffee, chocolate, and energy drinks, can cause blood vessels to constrict and worsen symptoms. Processed foods high in sugar and refined carbohydrates may also contribute to inflammation and reduce circulation.

Additionally, foods rich in trans fats, like fried foods and certain packaged snacks, should be limited as they may exacerbate vascular issues. It’s also advisable to limit alcohol consumption, as alcohol can impair circulation, leading to potential flare-ups.

2. What is the root cause of Raynaud’s disease?

Raynaud’s disease occurs when blood vessels in the extremities, such as the fingers and toes, constrict excessively in response to triggers like cold or stress. In most cases, the cause of Raynaud’s is unknown, but it may be linked to certain factors. Primary Raynaud’s is often considered idiopathic (without a clear cause).

However, secondary Raynaud’s, which is more severe, is typically associated with autoimmune diseases like lupus, scleroderma, or rheumatoid arthritis. It can also be linked to certain medications, smoking, or even hormonal changes.

Genetic factors can play a role, with individuals having a family history of Raynaud’s being more likely to develop the condition.

3. How to fix Raynaud’s syndrome?

While there is no definitive cure for Raynaud’s syndrome, there are several ways to manage the condition effectively.

The first step is avoiding triggers, such as extreme cold or stress, by dressing warmly and managing anxiety. Medications may be prescribed to improve blood flow, such as vasodilators or calcium channel blockers, which help relax blood vessels.

In severe cases, surgical options, like sympathectomy (cutting nerves that cause blood vessels to constrict), may be recommended. Lifestyle changes, including regular exercise to improve circulation, can also help.

Stress management techniques such as yoga or meditation can reduce the frequency of attacks by helping to manage emotional triggers. For some, dietary changes and warm clothing are sufficient to manage symptoms.

4. At what age does Raynaud’s start?

Raynaud’s disease commonly begins between the ages of 15 and 30, though it can appear at any age. The condition is more prevalent in women, especially those under 40, and tends to worsen with age.

It is important to recognize that primary Raynaud’s often develops during adolescence or early adulthood, while secondary Raynaud’s, which is linked to other health conditions, may appear later in life. It’s essential to remain vigilant for symptoms, even in early adulthood, as managing the condition early can help prevent long-term complications.

5. What is the life expectancy of someone with Raynaud’s disease?

Raynaud’s disease, on its own, does not significantly affect life expectancy. Most people with primary Raynaud’s live a normal lifespan. However, in cases where the disease is secondary to more serious conditions, such as scleroderma or lupus, complications may arise that could impact overall health.

In these cases, the severity of the underlying condition may determine the life expectancy, rather than the Raynaud’s disease itself. Timely management and treatment of both Raynaud’s and any related conditions can greatly improve outcomes and reduce risks.

6. How to test for Raynaud’s disease at home?

There is no definitive test for Raynaud’s disease that can be done at home, but you can monitor your symptoms. A simple method to check for Raynaud’s is to observe the color changes in your fingers and toes when exposed to cold or stress.

If your extremities turn white or blue and take longer than usual to return to their normal color, it may be a sign of Raynaud’s. Keep track of how often these color changes occur, their duration, and any accompanying numbness or tingling.

If you notice these symptoms frequently, it is important to consult a healthcare professional for a proper diagnosis, as they can perform a more comprehensive assessment, such as a blood test or an examination of your blood flow.

7. What are the red flags for Raynaud’s syndrome?

Red flags for Raynaud’s syndrome include frequent and prolonged episodes of color changes in the fingers or toes, particularly after exposure to cold or stress. Numbness or tingling that persists even after the trigger has passed may indicate a more severe form of the condition.

If you experience pain during these episodes, or if the frequency of attacks increases, it may be time to seek medical advice. Additionally, if Raynaud’s episodes occur alongside symptoms of other autoimmune diseases, such as joint pain or skin thickening, this may signal a secondary form of Raynaud’s that requires immediate attention.

The sudden development of sores or ulcers on your fingers or toes is also a sign that the disease may be progressing, and you should seek care promptly.

8. Does Raynaud’s affect the brain?

Raynaud’s Syndrome primarily affects the extremities, such as the fingers and toes, by reducing blood flow to these areas. It does not directly impact the brain.

However, in severe cases of secondary Raynaud’s, where the condition is associated with underlying autoimmune diseases like lupus or scleroderma, vascular problems could affect other organs, including the brain.

For example, Raynaud’s-associated diseases can increase the risk of stroke or other circulatory issues. If you experience symptoms such as dizziness or confusion alongside Raynaud’s, it’s crucial to seek medical attention to rule out any systemic issues affecting circulation to the brain.

9. What type of doctor to see for Raynaud’s?

If you suspect you have Raynaud’s, the first step is to consult your primary care physician, who can assess your symptoms and determine the next steps.

If your doctor suspects a more severe form of Raynaud’s or identifies an underlying autoimmune condition, they may refer you to a specialist, such as a rheumatologist or a vascular specialist.

A rheumatologist specializes in autoimmune diseases, which can be linked to secondary Raynaud’s, while a vascular specialist focuses on blood circulation and can help with diagnosing and treating circulation-related issues. Getting the right diagnosis is key to managing Raynaud’s effectively.

Conclusion

Raynaud’s syndrome is a condition that can often be dismissed as a minor inconvenience, but it can have serious implications for your health if not managed properly. Recognizing the early warning signs such as color changes in your fingers and toes, persistent numbness, or sensitivity to cold can help you take action before the condition worsens.

While Raynaud’s doesn’t typically affect life expectancy, ignoring it could lead to complications that affect your overall well-being. By paying attention to the red flags and consulting the right healthcare provider, you can effectively manage the symptoms and reduce the risks of long-term damage.

Whether it’s adjusting your diet, wearing warm clothing, or seeking medical treatment, taking proactive steps can significantly improve your quality of life and help you control the condition.

References

• Penn Medicine – Raynaud’s syndrome
• Boston Children’s Hospital – Raynaud’s Phenomenon
• British Heart Foundation – What causes Raynaud’s disease?
• Arthritis UK – Raynaud’s phenomenon
• UC Davis – Raynaud’s disease (Raynaud’s phenomenon)
• NHS – Raynaud’s
• Yale Medicine – Raynaud Syndrome: It’s Not Just Cold Fingers and Toes
• Raynaud’s Association – Welcome to the Raynaud’s Association
• Hospital for Special Surgery – Raynaud’s Phenomenon
• Healthdirect Australia Limited – Raynaud’s phenomenon
• American College of Rheumatology – Raynaud’s Phenomenon
• The Johns Hopkins University – Raynaud’s Phenomenon
• Sjögren’s Foundation – Raynaud’s and Sjögren’s Disease
• Harvard Health Publishing – Raynaud’s phenomenon
• NIH – Raynaud’s Phenomenon