Peripheral Vasodilation: Causes, Symptoms & When to Seek Care
Peripheral vasodilation = widening of arterioles/capillaries in extremities → increased blood flow, warmth, erythema, sometimes edema.
Common Triggers (Physiologic)
- Heat exposure (thermoregulation)
- Alcohol (direct vascular effect + acetaldehyde)
- Spicy foods (capsaicin → TRPV1 activation)
- Exercise (metabolic demand)
- Menopausal hot flashes (estrogen withdrawal → thermoregulatory instability)
Pathologic Causes
- Autonomic dysfunction (dysautonomia, POTS)
- Sepsis / SIRS (distributive shock)
- Carcinoid syndrome (serotonin, kallikrein)
- Mast cell activation / anaphylaxis
- Medication side effects: vasodilators (hydralazine, minoxidil, nitrates), CCBs, ACEi/ARBs, PDE5 inhibitors, niacin.
- Thyrotoxicosis, AV fistulas, arteriovenous malformations.
Red Flags for Evaluation
- Persistent/unexplained vasodilation
- Associated syncope, hypotension, tachycardia
- Signs of infection/sepsis
- New medication temporal association
- Systemic symptoms (weight loss, flushing diarrhea → carcinoid)
Beneficial vasodilation (exercise, heat) is self-limited. Pathologic forms require treating the underlying condition.
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