They also may be large, join together, and cover a large portion of the skin. Certain foods may also cause allergic symptoms. Common ones include fish, eggs, milk, nuts, and wheat. Symptoms include diarrhea, hives, eczema, headaches, asthma, and a runny nose. Food allergies often occur in children, who usually outgrow it after age three.
Anaphylactic shock is the most serious kind of allergic reaction and is life-threatening.
It affects many areas of the body at the same time. Insect stings, certain foods, and drugs such as penicillin may cause it. Within seconds or minutes, allergic shock affects breathing and circulation. If not treated right away, breathing may stop and death may occur. Whatever the type of allergy, learning the cause can help in effectively avoiding or managing the symptoms.