Allergies may take many forms, from mild specific food intolerance, hay fever and allergic conjunctivitis to life-threatening anaphylaxis. It is essential to distinguish between allergy and other phenomena. Gastrointestinal (GI) intolerance of non-steroidal anti-inflammatory drugs (NSAIDs), lactose intolerance and simply not liking something are not allergies.
This is a companion discussion topic for the original article at https://patient.info/doctor/dermatology/allergic-phenomena