Hives are mediated primarily by which chemical messenger?

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Prepare for the National Association of Nutritional Professionals (NANP) Domain IV Test. Review flashcards and multiple choice questions with detailed explanations. Get exam-ready!

Multiple Choice

Hives are mediated primarily by which chemical messenger?

Explanation:
Hives are driven primarily by histamine released from mast cells in the skin. When mast cells degranulate, histamine binds to receptors on nearby blood vessels and nerves, causing vasodilation, increased vascular permeability, and itching. This combination creates the characteristic pale, raised wheals and pruritus of urticaria. Serotonin, prostaglandins, and bradykinin can play roles in other inflammatory or pain processes, but they are not the main mediator producing the rapid, itchy wheals seen in hives. Antihistamines, which block histamine receptors, are typically effective because histamine is the primary driver of these symptoms.

Hives are driven primarily by histamine released from mast cells in the skin. When mast cells degranulate, histamine binds to receptors on nearby blood vessels and nerves, causing vasodilation, increased vascular permeability, and itching. This combination creates the characteristic pale, raised wheals and pruritus of urticaria.

Serotonin, prostaglandins, and bradykinin can play roles in other inflammatory or pain processes, but they are not the main mediator producing the rapid, itchy wheals seen in hives. Antihistamines, which block histamine receptors, are typically effective because histamine is the primary driver of these symptoms.

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