When an individual experiences asthma symptoms, the inflamed airways become constricted so it becomes more difficult to breathe through the narrowed air passages. For those with allergies, inhaling allergens may produce increased inflammation of the airway lining and further narrowing of the air passages. Asthma may also occur as a result of other stimuli, such as respiratory tract infections or exposure to irritants. Individuals who have allergies to specific foods may have severe and possibly life-threatening reactions if they eat them. The most common food allergy triggers are the proteins in cow s milk, eggs, peanuts, wheat, soy, fish, shellfish and tree nuts.
Food allergy occurs more frequently in children than adults.
Many of these children may lose their sensitivity to particular foods over time. Foods and other allergens, including penicillin, insect stings and latex, can trigger a severe, systemic allergic reaction called anaphylaxis . Anaphylaxis is caused by swelling throughout the body, and can involve several organ systems. Symptoms of anaphylaxis include a feeling of warmth, flushing, tingling in the mouth or a red, itchy rash. In severe cases, patients may experience a drop in blood pressure that results in a loss of consciousness and shock.