Parmesan cheese and vegetable-induced histaminuria in a thermal flusher.

Flushing disorders are associated with sweating (wet flushes) or without sweating (dry flushes). When associated with systemic symptoms and histaminuria, flushing reactions may easily be confused with mastocytosis or pheochromocytoma. We report a case of a woman with significant transient histaminuria that could be dissociated from episodes of thermal wet flushing. Treatment with clonidine led to a decrease in both frequency and intensity of the flushing reactions.