Allergies occur when your immune system reacts to a certain substance in the environment or food. Many times this causes severe symptoms which are treatable if diagnosed properly.
Allergies are one of the most common chronic diseases. A chronic disease lasts a long time or occurs often. 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. When someone has allergies, their immune system makes an antibody called immunoglobulin E (IgE). These antibodies respond to allergens. The symptoms that result in allergic reaction. Respiratory illness can be worsened by allergies.