Allergies occur when your immune system overreacts to a specific substance called an allergen, or trigger. Your immune system may identify the trigger—which is actually harmless—as a threat, and set ...

Food allergies occur when your body mistakenly identifies and treats an ingested food as a threat, triggering an immune system response. Even eating a tiny amount of the offending food can lead to ...

Hen’s egg allergy is among the most common food allergies in infants and young children, but is less common in older children and adults. Most children eventually outgrow their allergy to egg (71% by ...

Peanut allergy is the most common food allergy in children under age 18 and the third-most common food allergy in adults. Peanut allergy is usually lifelong: only about 20 percent of children with ...

An allergy rash can be uncomfortable and lead to infections, scarring, and other complications. The most common allergy rashes include atopic dermatitis (eczema), allergic contact dermatitis ...