IMMUNOLOGY

Detailed explanation-1: -Allergies are one of the most common chronic diseases. An allergy occurs when the body’s immune system sees a substance as harmful and overreacts to it. The substances that cause allergic reactions are allergens.

Detailed explanation-2: -An allergic reaction occurs when the immune system overreacts to exposure to antigens in the environment.

Detailed explanation-3: -Allergies are the result of your immune system’s response to a substance. Immune responses can be mild, from coughing and a runny nose, to a life-threatening reaction know as anaphylaxis. A person becomes allergic when their body develops antigens against a substance.

Detailed explanation-4: -Your immune system overreacts by producing antibodies called Immunoglobulin E (IgE). These antibodies travel to cells that release chemicals, causing an allergic reaction. This reaction usually causes symptoms in the nose, lungs, throat, sinuses, ears, lining of the stomach or on the skin.

Detailed explanation-5: -Allergens are usually proteins (called antigens) found in a non-infectious allergy-causing substance (for example pollens or dust mites), which ultimately trigger the immune system to respond in a way that can be harmful, causing tissue damage and serious disease.

Detailed explanation-6: -Antigens that can induce an allergic response are called allergens, and they are often derived from non-infectious or non-microbial sources.