Respiratory Allergy
Respiratory allergies are the most common allergies. Symptoms include sneezing, itchy and watery eyes and nose, and wheezing. Hay fever (also known as rhinitis) and/or asthma are the most common ways for respiratory allergies to manifest themselves. The respiratory system is usually affected if you're allergic to tree pollen, grass pollen, animals, molds and house dust mites.
Skin-related Allergy
Eczema, also called contact allergy or contact dermatitis, is the term used for an over-reaction in the skin caused by direct contact with certain substances (allergens) in our environment. It can be either allergic or non-allergic in nature. The two reactions often look the same. The only way to distinguish between the two is to perform an allergy test.
Food Allergy
Eczema, diarrhea, nausea, swelling of the throat, hypotension and, in worst cases, anaphylaxis are all signs of a food allergy. (Signs of anaphylactic reaction can include difficulty breathing, wheezing, chest tightness, nausea or dizziness. Medical attention should be sought immediately.) The most common foods that cause allergies are cow's milk, egg proteins, soy, peanuts and fish.
Insect Allergy
Allergy to insect stings occurs as a severe local skin reaction, exhaustion, dizziness, swelling of the throat and, in worst cases, anaphylaxis.