Raynaud's phenomenon.
Raynaud's phenomenon is episodic vasospasm of small arteries in the fingers and toes (and sometimes nose, ears, lips), triggered by cold or stress. Classic presentation: well-demarcated color changes — white (vasospasm), blue (cyanosis), red (reperfusion). The critical question is primary vs secondary. Primary Raynaud's is benign. Secondary Raynaud's signals an underlying disease — most importantly, systemic sclerosis. Nailfold capillaroscopy plus ANA testing distinguishes them. Cold avoidance, smoking cessation, and calcium channel blockers are first-line treatment.
The mechanism, the simple-looking symptom with major implications.
Raynaud's looks straightforward — cold fingers, color changes, discomfort. But the diagnostic stakes are much higher than they appear. Four mechanisms determine what's actually going on:
Vasospasm of small arteries
The mechanism is excessive vasoconstriction of digital arteries in response to cold or stress. The triple color change — white, blue, red — reflects vasospasm, cyanosis, and reactive hyperemia.
Primary Raynaud's
Primary Raynaud's (Raynaud's disease) has no underlying connective tissue disease. Onset is typically younger (teens to 20s), symmetric, mild, with normal nailfold capillaries and negative autoantibodies. Benign course.
Secondary Raynaud's
Secondary Raynaud's signals an underlying disease — most importantly systemic sclerosis, but also lupus, MCTD, Sjögren's, antiphospholipid syndrome, certain medications, and occupational exposures. Onset is typically older, more severe, with abnormal nailfold capillaries and positive autoantibodies.
Nailfold capillaroscopy
Examining the nailfold capillaries (the small vessels at the base of the fingernail) under magnification differentiates primary from secondary Raynaud's. Dilated, dropout, or hemorrhagic capillaries suggest secondary Raynaud's and warrant a full CTD workup.
The 4-step plan, applied to Raynaud's.
Get the right diagnosis
History (age of onset, severity, triggers), nailfold capillaroscopy (the most useful single test), ANA with ENA panel, complete CTD serology, baseline PFTs and echocardiogram if secondary features are present. The 2014 consensus criteria differentiate primary from secondary Raynaud's.
Learn more about labs →Clean up your food
Adequate caloric intake (cold sensitivity worsens with low body fat). Warm beverages and warming foods. Avoid caffeine and alcohol which can worsen vasospasm in some patients.
Raynaud's & diet →Detox your daily life
Cold protection is the foundation — layered clothing, gloves, warm footwear, hand warmers, room temperature control. Smoking cessation is non-negotiable (nicotine is a potent vasoconstrictor). Avoid sympathomimetic medications when possible.
Raynaud's & environment →Build a stronger body
Regular aerobic exercise improves overall circulation. Hand mobility work prevents stiffness during prolonged vasospasm. Resistance training improves overall vascular function.
Raynaud's & exercise →
Go deeper.
Common misconceptions.
"Cold hands are just cold hands."
Cold sensitivity is universal. True Raynaud's has well-demarcated color changes (white, blue, red) and is reproducible with cold exposure. Distinguishing Raynaud's from generic cold intolerance matters because Raynaud's can signal underlying connective tissue disease.
"Raynaud's is harmless."
Primary Raynaud's is typically benign. Secondary Raynaud's is the question — and it can be the first sign of systemic sclerosis years before skin changes appear. Up to 90% of patients with systemic sclerosis have Raynaud's at presentation. Early identification of secondary Raynaud's allows early screening for evolving CTD.
"There's no treatment besides wearing gloves."
Calcium channel blockers (nifedipine, amlodipine) are first-line pharmacologic treatment. PDE5 inhibitors (sildenafil, tadalafil) work for severe disease. Prostacyclin analogs help digital ulcers. Topical nitrates can help. Biofeedback and stress management have evidence too. Most patients improve substantially with combined approaches.
When to see a rheumatologist.
See a rheumatologist if you have:
- Well-demarcated color changes in fingers or toes (white, blue, red) with cold or stress
- Raynaud's symptoms plus a positive ANA
- Raynaud's plus joint pain, dry eyes/mouth, swollen hands, or skin tightening
- Digital ulcers or pitted scars at the fingertips
- New-onset Raynaud's after age 30 (more likely secondary)
- Severely asymmetric Raynaud's (suggests a vascular or compressive cause)
- Raynaud's plus family history of connective tissue disease
Nailfold capillaroscopy plus ANA testing should be done in any new-onset Raynaud's that doesn't have a clear secondary cause. Catching evolving systemic sclerosis early matters more than almost any other diagnostic decision in rheumatology.
- Maverakis E, et al. International consensus criteria for the diagnosis of Raynaud's phenomenon. J Autoimmun, 2014. PubMed 24485156
- Wigley FM, Flavahan NA. Raynaud's phenomenon. N Engl J Med, 2016. PubMed 27532832
- Cutolo M, et al. Nailfold capillaroscopy in systemic sclerosis. Best Pract Res Clin Rheumatol.
- Herrick AL. Evidence-based management of Raynaud's phenomenon. Ther Adv Musculoskelet Dis.