Hives (Urticaria) are skin reactions that cause red or white itchy welts, which vary in size and appear and fade repeatedly as the reaction runs its course. Chronic hives is a condition in which the welts last more than six weeks or recur over months or years. Chronic hives usually aren't life-threatening.
Aspirin is used to relieve the symptoms of arthritis, lupus, fever, mild to moderate pain and prevent heart attacks in people who have had a heart attack in the past. Sensitivity to aspirin can cause acute urticaria in some individuals, worsen pre-existing chronic urticaria in others or, rarely, act with food or exercise to provoke anaphylaxis (a severe hypersensitivity reaction). Individuals who react with urticaria appear to come from a different population to those who react with asthma, although there is some overlap. Aspirin-sensitive chronic urticaria patients may also react adversely to some food additives.
Related to:
HNMT, Histamine, Aspirin, acetylsalicylic acid, chronic urticaria, allergic inflammation