What Is Raynaud Disease?
Raynaud phenomenon is a vasomotor disorder characterized by episodes of excessive vasospasm of the digital arteries in response to cold or emotional stress. It manifests as a classic change in color of the fingers: pallor (ischemia), cyanosis (deoxygenation), and rubor (reactive reperfusion).
It affects 3-5% of the general population, with female predominance (9:1). Two forms are distinguished: primary Raynaud (Raynaud disease — without underlying disease, benign, accounting for 80-90% of cases) and secondary Raynaud (Raynaud phenomenon — associated with connective tissue diseases, especially scleroderma and lupus).
Primary Raynaud typically begins between 15 and 30 years of age, is symmetric, affects the fingers (and occasionally the toes, nose, and ears), and does not cause trophic lesions. Secondary Raynaud tends to be more intense, asymmetric, with onset after age 30, and may cause digital ulcers and ischemic necrosis.
Digital Vasospasm
Raynaud results from excessive vasoconstriction of the digital arteries and arterioles, with near-complete closure of blood flow for minutes to hours.
Primary vs. Secondary
Primary Raynaud is benign and functional. Secondary Raynaud is associated with autoimmune diseases and may cause severe ischemic lesions. Periungual capillaroscopy distinguishes the two forms.
Vascular Mediators
The imbalance between vasodilators (NO, prostacyclin) and vasoconstrictors (endothelin-1, serotonin, thromboxane) is central in pathophysiology.
Pathophysiology
Normally, exposure to cold causes cutaneous vasoconstriction to conserve body heat — a reflex mediated by the sympathetic nervous system. In Raynaud, this response is exaggerated: the digital arteries undergo intense and prolonged spasm, almost completely interrupting blood flow to the fingers.
In primary Raynaud, vasospasm results from hyperactivity of alpha-2 adrenergic receptors in the smooth muscle of the digital arteries and from local reduction of nitric oxide (NO). Sympathetic activation by cold causes disproportionate vasoconstriction. There is no structural lesion of the vessels.
Secondary Raynaud and Vascular Lesion
In secondary Raynaud, in addition to functional vasospasm, there are structural changes in the vessels: intimal proliferation, adventitial fibrosis, and reduction of the arterial lumen. Endothelin-1 (a potent vasoconstrictor) is chronically elevated, and NO production is reduced by endothelial dysfunction.
In scleroderma, vascular injury is the earliest pathogenic event — Raynaud precedes other symptoms by years. Progressive obliteration of the digital arteries leads to chronic ischemia, digital ulcers, and eventually gangrene. Periungual capillaroscopy shows dilation and rarefaction of capillaries, indicating microangiopathy.
Symptoms
Raynaud episodes are typically triggered by ambient cold or contact with cold objects, and less frequently by emotional stress. Each attack lasts from minutes to hours.
Manifestations of Raynaud Disease
- 01
Triphasic color change of the fingers
Pallor (white) followed by cyanosis (blue) and rubor (red). May affect one or more fingers, typically sparing the thumb in primary Raynaud.
- 02
Numbness and tingling
Sensation of "dead fingers" during the ischemic phase (pallor). Tingling intensifies in the reperfusion phase (rubor).
- 03
Pain or burning on reperfusion
The rubor phase is frequently painful — fingers "burn" and throb when blood flow returns.
- 04
Persistent coldness of the fingers
Even between attacks, fingers may be colder than usual, indicating increased baseline vasoconstriction.
- 05
Digital ulcers (secondary Raynaud)
Painful ischemic lesions on the fingertips or around the nails. Indicate structural vascular injury and underlying disease.
- 06
Involvement of feet, nose, and ears
In addition to the fingers, other extremities may be affected, especially in cold climates.
Diagnosis
The diagnosis of Raynaud is essentially clinical, based on a history of triphasic episodes of color change of the fingers triggered by cold. Periungual capillaroscopy is the most important test to distinguish primary Raynaud (normal capillaries) from secondary Raynaud (megacapillaries, hemorrhages, avascular areas).
Laboratory tests include ANA (antinuclear antibody), anti-centromere, anti-Scl-70, ESR, CRP, and complement for screening of autoimmune diseases. The cold provocation test (immersion of hands in cold water) can reproduce symptoms but has limited sensitivity.
🏥Differentiation between Primary and Secondary Raynaud
- 1.Primary: onset before age 30, symmetric, no ulcers, negative ANA, normal capillaroscopy
- 2.Secondary: onset after age 30, asymmetric, digital ulcers, positive ANA, abnormal capillaroscopy
- 3.Capillaroscopy: megacapillaries and avascular areas indicate scleroderma microangiopathy
- 4.Positive anti-centromere: associated with limited scleroderma (CREST)
- 5.Positive anti-Scl-70: associated with diffuse scleroderma
Differential Diagnosis
Primary Raynaud phenomenon is benign, but secondary Raynaud — associated with connective tissue diseases — requires investigation and treatment of the underlying disease to prevent serious complications.
DIAGNÓSTICO DIFERENCIAL
Diagnóstico Diferencial
Scleroderma
- Raynaud + cutaneous sclerosis
- Anti-centromere or Scl-70 antibody
- Telangiectasias
- Raynaud + ANA = rheumatology
Testes Diagnósticos
- ANA
- Anti-Scl-70
- Anti-centromere
Systemic Lupus Erythematosus
- Raynaud + photosensitivity + arthralgia
Testes Diagnósticos
- ANA
- Anti-DNA
Thoracic Outlet Syndrome
- Symptoms with arm elevation
- Neurovascular compression
- Positive Adson test
Testes Diagnósticos
- Positional Doppler
- Adson
Digital Arterial Occlusion
- Severe constant pain
- Does not resolve with rewarming
- Digital ulcers
- Digital ischemia = urgent vascular
Testes Diagnósticos
- Arterial Doppler
- Angiography
Ergotism
- Use of ergot derivatives
- Drug-induced vasospasm
Testes Diagnósticos
- Pharmacologic history
Scleroderma: The Raynaud That Heralds a Severe Disease
Scleroderma (systemic sclerosis) is the connective tissue disease most strongly associated with Raynaud phenomenon — present in 95% of patients. Raynaud frequently precedes cutaneous manifestations by years. Changes on periungual capillaroscopy (dilation and destruction of capillaries, with avascular areas) are early findings highly specific for scleroderma.
Anti-centromere antibodies (associated with the limited form — CREST) and anti-Scl-70 (topoisomerase I, associated with the diffuse form) are specific diagnostic markers. Every patient with Raynaud and positive ANA should be referred to a rheumatologist. Early treatment can prevent pulmonary fibrosis and pulmonary arterial hypertension, severe complications of scleroderma.
Thoracic Outlet Syndrome: Mechanical Compression
Thoracic outlet syndrome (TOS) results from compression of neurovascular structures (brachial plexus, subclavian artery, and vein) in the space between the clavicle and the first rib. Vascular TOS can cause vasospasm and digital ischemia that mimics Raynaud. Symptoms worsen with elevation of the arm above the head — an important sign in the clinical history.
The Adson test (decreased radial pulse with cervical extension and rotation to the affected side during inspiration) and the hyperabduction test have moderate sensitivity. Positional Doppler — assessment of arterial flow in provocative positions — is the most useful complementary test. The physician may indicate physical therapy to open the outlet and, in severe cases, surgical decompression.
Primary vs. Secondary Raynaud: How to Distinguish
The distinction between primary Raynaud (idiopathic, benign) and secondary Raynaud (associated with systemic disease) is fundamental. Features of primary Raynaud: onset in young women, bilateral and symmetric symptoms, no digital ulcers, no necrosis, normal capillaroscopy, and negative autoimmune antibodies. The absence of these features or the presence of digital ulcers, unilateral Raynaud, late onset, or positive ANA require investigation of underlying disease.
The medical acupuncturist performs systemic screening in all patients with Raynaud, with ANA, complete blood count, ESR, CRP, and capillaroscopy when available, before classifying the picture as primary. Acupuncture has a complementary role in primary Raynaud for reducing the frequency and intensity of vasospastic attacks.
Treatment
Treatment of primary Raynaud prioritizes cold protection measures and modification of aggravating factors. Pharmacotherapy is reserved for cases with frequent or disabling attacks.
Thermal Protection and Lifestyle
Thermal gloves, portable hand warmers, avoiding unnecessary cold exposure, keeping the whole body warm (general body cold triggers digital vasospasm), smoking cessation (nicotine is vasoconstrictor), avoiding vasoconstrictor medications (beta-blockers, ergotamine).
First-Line Pharmacotherapy
Dihydropyridine calcium channel blockers (nifedipine 30-60 mg/day or amlodipine 5-10 mg/day) are the most widely used drugs — they relax vascular smooth muscle and reduce the frequency and severity of attacks by 30-50%.
Second-Line Therapies
PDE-5 inhibitors (sildenafil 20 mg 3x/day — increase cGMP and NO), losartan (blocks vasoconstrictor angiotensin II), fluoxetine (modulates platelet serotonin), topical nitroglycerin on affected fingers.
Severe Secondary Raynaud
IV prostacyclin (iloprost) for digital ulcers, endothelin antagonists (bosentan) for prevention of new ulcers, digital sympathectomy (surgical denervation) in refractory cases, acupuncture as adjunct.
Acupuncture as Treatment
Acupuncture in Raynaud disease is studied with the objective of modulating digital perfusion through potential local and systemic vasodilation. Proposed mechanisms include possible stimulation of nitric oxide release, potential reduction of sympathetic tone, influence on vasodilator peptides (CGRP — calcitonin gene-related peptide), and modulation of vascular reactivity to cold — hypotheses that derive mostly from experimental studies.
Some studies suggest that acupuncture may reduce the frequency and severity of Raynaud episodes in some patients, with measurable variation in digital temperature on thermography; however, the evidence base is limited and heterogeneous. Moxibustion (heating of acupuncture points) is traditionally used in this condition and may contribute a vasodilator and warming effect.
Acupuncture is a noninvasive complementary option, among non-pharmacologic approaches, considered for primary Raynaud as an adjunctive approach to reduce attack frequency. It can be integrated into pharmacologic treatment in secondary Raynaud, without replacing it, and with no described pharmacologic interactions with calcium blockers, PDE-5 inhibitors, losartan, or prostacyclin analogues. Protocols of 10-12 sessions with seasonal maintenance (intensification in winter) are common and should be individualized.
Prognosis
Primary Raynaud has an excellent prognosis. It does not cause trophic lesions, does not progress to severe disease, and may even improve with age (especially after menopause). Quality of life can be significantly impacted in cold climates, but there is no risk of digital loss.
About 3-5% of patients initially classified as primary Raynaud progress to a connective tissue disease over years. Periodic follow-up with capillaroscopy and autoantibodies allows early detection of this transition.
Secondary Raynaud has a prognosis dependent on the underlying disease. In scleroderma, recurrent digital ulcers affect 30-50% of patients and may lead to digital amputation in severe cases. Early and aggressive treatment of digital vasculopathy with iloprost and bosentan has significantly reduced morbidity.
Myths and Facts
Myth vs. Fact
Having cold hands means you have Raynaud.
Cold hands are common and normal, especially in women. Raynaud requires episodic color change (pallor and/or cyanosis) clearly demarcated, not just coldness.
Raynaud is a serious and dangerous disease.
Primary Raynaud (80-90% of cases) is benign and does not cause permanent lesions. Only secondary Raynaud associated with autoimmune diseases can cause serious complications.
People with Raynaud cannot live in cold places.
With adequate protective measures (gloves, warmers, layered clothing) and possible pharmacologic treatment, patients with Raynaud can live in any climate.
Warming the hands quickly is the best solution.
Rewarming should be gradual. Warming quickly (hot water, hair dryer) can cause burns in fingers with reduced sensitivity from ischemia and worsen discomfort.
Raynaud only affects young women.
Although it predominates in young women, Raynaud can affect men and arise at any age. Onset after age 30 should raise suspicion of secondary Raynaud.
When to Seek Help
Although primary Raynaud is benign, certain situations require medical evaluation.
Frequently Asked Questions
Frequently Asked Questions
Raynaud phenomenon is a reversible vasospasm of digital arteries and arterioles in response to cold or emotional stress. It causes triphasic color changes in the fingers: pallor (ischemia), cyanosis (deoxygenation), and erythema (reactive hyperemia after the spasm). It mainly affects the hands but can occur in the feet, ears, and nose.
Primary Raynaud is idiopathic, occurs in young women, is bilateral and symmetric, without ulcers or gangrene, and without associated systemic disease. Secondary Raynaud is associated with diseases such as scleroderma, lupus, and other connective tissue diseases — it has a more severe course, higher risk of digital ulcers, and requires investigation and treatment of the underlying disease. Capillaroscopy and autoimmune antibodies distinguish the two types.
Preliminary clinical studies suggest that acupuncture may relieve the frequency and duration of Raynaud attacks in some patients, especially in the primary form — the evidence base is still limited. Proposed mechanisms include potential vasodilation mediated by neuropeptides, possible modulation of the sympathetic nervous system, and possible reduction of the vasospastic response to cold. The medical acupuncturist can assess the indication as a complementary option among non-pharmacologic approaches, individualizing management — particularly useful for patients who tolerate vasodilators poorly.
Primary Raynaud frequently improves during pregnancy, probably due to the physiologic vasodilation of the gestational state. Secondary Raynaud due to scleroderma or lupus requires more careful monitoring during pregnancy, since these diseases bring their own obstetric risks. Pharmacologic management should be adapted for pregnancy, with calcium channel blockers considered with caution due to the teratogenic risk of some agents.
Long-acting calcium channel blockers (nifedipine 30-60 mg/day, amlodipine 5-10 mg/day) are the first-line pharmacologic option for Raynaud. They act by relaxing vascular smooth muscle, reducing vasospasm. They reduce the frequency and intensity of attacks in 50-66% of patients. Side effects include headache, flushing, ankle edema, and hypotension, especially in the first weeks.
Digital ulcers indicate severe secondary Raynaud, typically associated with scleroderma. They are extremely painful and difficult to heal. Treatment includes: potent vasodilators (intravenous iloprost, sildenafil, bosentan), specialized dressings, adequate analgesia, and prevention of secondary infection. Digital ulcers with suspicion of infection or gangrene require urgent evaluation by the vascular surgeon and rheumatologist.
Yes. Emotional stress activates the sympathetic nervous system, causing peripheral vasoconstriction that can trigger or worsen Raynaud attacks. Therefore, stress-reduction techniques — including biofeedback, relaxation, and acupuncture — have a documented therapeutic role. Patients with Raynaud report attacks in situations of anxiety even in the absence of cold exposure.
Cold protection measures are fundamental and frequently underestimated. Practical recommendations: use heated gloves (with hand warmers) before going out in the cold; avoid sudden temperature changes; wear layered clothing to keep the body core warm (peripheral vasoconstriction is a reflex to protect central temperature); use thick socks and closed shoes; avoid handling iced objects directly.
Yes, significantly. Nicotine causes direct vasoconstriction and worsens Raynaud vasospasm. Smokers with Raynaud have more frequent, longer attacks and a higher risk of digital ulcers. Smoking cessation is one of the most effective measures to improve Raynaud and should be strongly encouraged in all patients.
Raynaud of the feet occurs in up to 40% of patients with Raynaud of the hands but rarely manifests in isolation. The presentation is the same triphasic color change, but attacks tend to be less frequent due to less cold exposure. Isolated Raynaud of the feet, especially unilateral, should prompt investigation of peripheral arterial disease, embolism, or local thrombosis, in addition to the usual systemic causes of secondary Raynaud.
Related Reading
Deepen your knowledge with related articles