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Why Does My Skin Itch When I Exercise

Researchers are just beginning to understand that histamine also plays a role in exercise. Previously, a popular theory on itchiness had to do with blood vessel expansion. The idea is when blood vessels expand after a period of relative inactivity, the surrounding nerves, mistakenly register the expansion as itchiness. The body expands blood vessels during exercise to help bring more oxygen and nutrients to working muscles, and to eliminate carbon dioxide and waste products. Get full access to Outside Learn, our online education hub featuring in-depth fitness, nutrition and adventure courses and more than 2,000 instructional videos when you sign up for Outside+.

Why Does My Skin Itch When I Exercise – Answer & Related Questions

If there is any mildew or mold growth on your neglected workout clothes, it’s likely that the itch is related to an exercise-induced histamine response. Histamine is a chemical in the body that is most commonly associated with allergic reactions, itching, and inflammation.

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