Cholinergic urticaria (CU) is a type of hives brought on by raised body temperature. It typically develops when you exercise or sweat, and it appears or disappears on its own within a few hours.
CU can be accompanied by exercise-induced anaphylaxis, a more severe allergic reaction to exercise. If you are experiencing this kind of condition, you should administer EpiPen while waiting for help.
You can also turn to some medications for help. Antihistamines are the first line of medication, which include H1 antagonists, like hydroxyzine (Vistaril), and H2 antagonists, like cimetidine (Tagamet).
You may also need the medications to control the amount you sweat, such as methantheline bromide or montelukast (Singulair), and the beta blockers, immunosuppressants, or even UV light to treat CU.
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