Dr. Rao is a doctor who is specially trained and experienced in the diagnosis and treatment of allergic diseases and related conditions. These include asthma, hay fever, sinusitis, hives, and certain kinds of allergic reactions to foods, insect stings, and drugs. Dr. Rao and his team will help you get tested, get treated and get better! Allergy problems arise when your immune system overreacts to an allergensomething that is usually harmless, such as plant pollen, dust mites, mold, insect stings, and certain foods. If you have an allergy, your immune system acts as if the allergens were dangerous, releasing a chemical called histamine that causes allergy symptoms. If the allergen is something you breathe in from the air, your reaction will most likely affect your eyes, nose, and lungs. If it's something you eat, it may affect your mouth, stomach and intestines. Food allergies also can cause skin rashes or even asthma symptoms