This effect is not unique to alcohol but can also occur with long-term use of drugs which have a similar mechanism of action to alcohol such as the benzodiazepines, which are sometimes prescribed as tranquillizers to people with alcohol problems.
The topic of allergies has become routine in our lives, and certainly most everyone has an idea of what an allergy is. Allergies are so common a subject in fact, it seems acceptable to discuss your allergies at a cocktail party with strangers. An allergy is an abnormal reaction by a person's immune system against a normally harmless substance.
Histamine is a chemical our bodies produce naturally, and it's also found in certain foods. In situations involving true allergies, your body releases histamine, and that histamine, in turn, provokes the response we think of as an allergic reaction. Histamine intolerance isn't a true allergic reaction.