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There are different types of triggers for allergies. These triggers can include foods, pets, medicines, and even sun exposure . There are four types of allergies: respiratory allergy, skin-related allergy, food allergy and insect allergy.

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 plant pollen, animals, molds and house dust mites, which all produce allergens that float around in large quantities.

Skin-Related Allergy:
Eczema, also called 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, meaning it is not caused by antibodies. Examples of skin related reactions that are not specifically allergic include nickel, cosmetics, and chemicals. 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 an 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 can occur as a large local skin reaction, exhaustion, dizziness, swelling of the throat and, in worst cases, anaphylaxis. Examples of insect allergies include bee and fire ant stings.