If you have a food allergy, your immune system overreacts to a particular protein found in that food. Symptoms may occur when coming in contact with just a tiny amount of the food.
Food allergies are usually diagnosed in childhood, though they may also develop in older children and adults. While many children outgrow a food allergy, it is also possible for adults to develop allergies to particular foods.

Allergic reactions may result if a sensitive person is stung by certain insects. Usually the insect is a member of the Hymenoptera family (bee, wasp, yellow jacket, hornets, and rarely ants). Mosquito bites may produce local reactions, but not severe generalized symptoms.
Studies have shown that stinging insects have some venom allergens (antigens) in common, while some are unique to a particular insect. Therefore, a patient who is allergic to one Hymenoptera may or may not be allergic to others. It is best for insect sensitive patients to avoid contact with all types of stinging insects.

Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death. Anaphylaxis occurs when the body’s immune system sees something as harmful and over reacts. The result is symptoms such as itching, vomiting, wheezing or swelling. Allergens common triggers. Medicines, foods, insect stings, and latex may cause severe allergic reactions. With proper evaluation, allergists can identify most causes of anaphylaxis.