Which hormone is responsible for itching?
Short answer: Itching (pruritus) is most commonly mediated by histamine released from mast cells, which acts on sensory nerve endings. Other mediators—particularly certain cytokines (notably interleukin-31), neuropeptides (e.g., substance P), and opioid peptides—also produce itch, especially in chronic or non-histaminergic cases.
Explanation
Acute itch is frequently triggered when mast cells release histamine, which binds H1 receptors on cutaneous sensory nerves and provokes the itch sensation; this is why H1 antihistamines relieve many allergic itches. However, itching is not caused by a single “itch hormone.” Chronic or systemic pruritus often involves additional mediators: interleukin-31 (IL-31) is strongly linked to atopic dermatitis and chronic itch, proteases can activate PAR2 receptors, and central nervous system transmitters (gastrin-releasing peptide, opioids) modulate itch perception. Underlying causes include dermatologic inflammation, dry skin, medications, liver or kidney disease, neuropathic conditions, and systemic disorders—each with differing dominant mediators.
Tips
- For allergic or histamine-driven itch, non-sedating H1 antihistamines often help; sedating antihistamines may aid nighttime itch.
- Use emollients and avoid hot showers to reduce dry-skin-related itch.
- Topical corticosteroids or calcineurin inhibitors treat inflammatory skin causes (eczema, dermatitis).
- Avoid known irritants and tight clothing; keep nails short to limit skin damage from scratching.
- See a clinician for persistent, widespread, nocturnal, or systemic-associated itch to assess for underlying disease and targeted therapies.
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