Hay fever, also called allergic rhinitis, causes congestion, itchy, runny nose and itchy, watery or swollen eyes (conjunctivitis). Atopic dermatitis (Skin Allergy) causes itchy skin, red skin and flaking or peeling skin. Swelling of the lips, tongue, face or throat, hives, abdominal pain, diarrhea, nausea or vomiting, dizziness, lightheadedness or fainting and anaphylaxis are symptoms of food allergy. An insect sting may cause allergy leading to large area of swelling (edema) at the sting site, itching all over your body, cough, chest tightness, wheezing or shortness of breath and anaphylaxis.
Allergy can be diagnosed through Skin prick test, Blood test, Patch test, Oral food challenge, Trial elimination diet and In-vitro tests for Allergen-specific IgE ("RAST" tests ("Radio-AllergoSorbent Test").
Antihistamines, Immunotherapy, Emergency epinephrine and numerous other drugs are used to treat allergy
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