➤ Why does pheochromocytoma cause hyperhidrosis and palpitations?
Excess catecholamines stimulate sympathetic alpha and beta receptors, causing sweating and increased cardiac rate and contractility. Sweating results from sympathetic cholinergic stimulation of eccrine glands, while palpitations reflect tachycardia and increased stroke volume. These effects often occur in paroxysmal hypertensive episodes and produce the classic diaphoresis and pounding heart sensation.
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