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What are the main types of allergic diseases?
Allergy is a condition that makes the immune system respond abnormally to foreign elements. However, the same elements do not affect most others around you. When an allergic person comes into contact with his/her allergen, symptoms, such as sneezing, difficulty in breathing, itchiness and watery eyes may be experienced. There are several kinds of allergic diseases. A few examples are discussed below: • Drug Allergy: It is a condition that causes rashes, hives and labored breathing after intake of certain medicines. The immune system of the patient becomes oversensitive to a particular substance in the drug and releases chemicals in defense. An allergic reaction is triggered and symptoms are experienced. • Asthmatic Allergy: Allergic asthma is one of the most common types of asthma. It is triggered by exposure to the same allergens that trigger allergy symptoms. However, in case of allergic asthma, the allergens trigger an asthma attack in addition to the allergy symptoms. This happens due to hypersensitivity of the airways in response to certain allergens. The immune system reacts and patients experience shortness of breath, coughing, wheezing, chest tightness and fast breathing. Muscles around the airways tighten and they get narrower and inflamed. They are also flooded with thick mucus. • Food Allergy: It is a condition where the immune system is reactive to certain foods. The allergic reaction can be mild or severe (anaphylaxis). Common symptoms of food allergy are swelling or itching in the mouth, diarrhea, vomiting, abdominal cramps, eczema or hives, shortness of breath, tightening of the throat and lowering of blood pressure. • Skin Allergy: Infections, certain medicines, immunity disorders and other allergens can irritate the skin and trigger an allergic reaction. When the allergic reaction makes the immune system respond, it is called skin allergy. Common examples of skin allergies are eczema, hives and hereditary angioedema. • Eye Allergy: It is a condition involving redness, itchiness, tearing and burning sensation in the eyes. Eye allergies or allergic conjunctivitis occur when your eyes get irritated in response to a certain allergen. The eyes release a chemical called histamine as protection against the allergen. This makes the conjunctiva (the mucus membrane covering the front of the eye and the lining inside of the eyelids) and the eyelids swollen, red and itchy.
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