Allergy
Allergies include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, a runny nose, shortness of breath, or swelling. Common allergens include pollen and certain foods. Metals and other substances may also cause problems. Diagnosis is typically based on a person’s medical history. Risk factors include host, sex, race, and...