Allergen is any substance that causes an allergic reaction. Many allergens such as pollen of plants, molds exposure, dust mites, animal dander and the hazardous chemicals are airborne particles. In these cases, symptoms arise in areas in contact with air, such as the eyes, the nose, and the lungs. Example is allergic rhinitis, also known as hay fevers, a condition due to allergy that imitates a continuing cold. Symptom includes irritation of the nose, sneezing, itching and redness of the eyes. Inhaled allergens can also lead to an asthmatic symptoms caused by narrowing of the airways and increased production of secretion in the lungs, shortness of breath coughing and wheezing.
Aside from these allergens in surrounding area, allergic reactions can result from foods, insect stings, and reactions to medicines like aspirin and antibiotics such as penicillin. Symptoms of food allergy include abdominal pain, swollen or inflated, vomiting, diarrhea, itchy skin, and swelling of the skin during hives. Food allergies rarely cause asthmatic reactions, or rhinitis. Insect stings, antibiotics, and certain medicines produce a systemic allergic response that is also called anaphylaxis (extreme sensitivity); multiple organ systems can be affected, including the digestive system, the respiratory system, and the circulatory system. Depending of the rate of severity, it can cause continuous reactions, enlargement, low blood pressure, coma, and even death.
Latex is also common causes of allergic reactions this is a substances that touches the skin. This is also known as contact skin inflammation. Skin allergies often cause rashes, or swelling and inflammation within the skin.
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