Flushing

Flushing is a transient redness and sensation of warmth, most often across the face, neck and upper chest, caused by the small blood vessels near the skin surface widening and filling with blood. Much of the time it is entirely benign and situational: heat, exercise, embarrassment or strong emotion, alcohol (especially in people who flush easily), spicy foods, and hot drinks are all everyday triggers. Some people simply have naturally reactive skin, and conditions such as rosacea cause a tendency to facial flushing and redness. Around the time of menopause, hot flushes — sudden waves of heat with flushing and sweating — are very common and hormonal. Less often, recurrent flushing is a clue to a hormonal or systemic cause. A pheochromocytoma (an adrenaline-secreting adrenal tumour) can cause flushing, though pallor during spells is actually more typical. Carcinoid syndrome, from a rare hormone-secreting tumour, causes characteristic flushing often with diarrhoea and wheezing. An overactive thyroid causes heat intolerance and flushing, and certain medications (including some for blood pressure and, notably, niacin) cause flushing as a side effect. So while most flushing is harmless, a persistent, unexplained or spell-like pattern — especially with other symptoms — is worth looking into.

• Everyday triggers — heat, exercise, emotion or embarrassment, alcohol, spicy food, hot drinks.
• Rosacea — a tendency to facial flushing and redness.
• Menopause — hot flushes, a very common hormonal cause.
• Overactive thyroid (hyperthyroidism) — heat intolerance with flushing.
• Medications — niacin, some blood-pressure drugs, and others.
• Pheochromocytoma — an adrenaline-secreting tumour (though pallor is often more typical during spells).
• Carcinoid syndrome — a rare hormone-secreting tumour; flushing with diarrhoea and wheezing.

Flushing with an obvious trigger (heat, alcohol, spicy food) or the clear pattern of menopause needs no tests. When flushing is recurrent, unexplained or comes in spells with other symptoms, a targeted work-up helps: TSH for an overactive thyroid, and, if the pattern suggests it, tests for a hormone-secreting tumour — metanephrines and VMA for a pheochromocytoma (especially with headache, sweating and palpitations), and specific tests for carcinoid syndrome (particularly if flushing comes with diarrhoea and wheezing). A medication review often identifies a cause. Mediora.AI can surface a thyroid or catecholamine pattern from your results that fits a specific cause, but recurrent unexplained flushing — especially with other symptoms — is assessed by your doctor.