Depends on cause
A/u due to bee, hornet, wasp, fire ant sting can be cured with allergy shots.
The patient gets the venom causing a/u in a series of injections. When the allergen
can be identified - drug, food, pet, plant - complete avoidance "cures" a/u but accidental exposure results in more symptoms. In 50% of anaphylaxis
& 90% of chronic urticaria the cause if never identified so cure is not yet possible.