The entrance into the body of allergens resulting in an altered state of tissues.
A disorder caused by hypersensitivity to a substance, such as a medication. An allergic reaction occurs when the immune system attacks a substance that is normally harmless as if it were a disease-causing organism. Allergic reactions to medication can include hives, itching, wheezing, throat tightening, and rarely, shock, an intense reaction quickly leading to difficulty in breathing, low blood pressure, rapid pulse, sweating, and collapse.
A specific type of response to an allergen, characterized usually by increased release of histamine and increase in the numbers of eosinophils in the blood. The reaction is far greater than the body’s normal response to the same allergen.
A reaction resulting from hypersensitivity to an antigen.
In the fascinating realm of the immune system, a notable cascade unfolds when the body encounters certain environmental substances. This encounter triggers a series of reactions, resulting in an immune response characterized by a diverse array of symptoms. These symptoms encompass the emergence of skin rash, localized inflammation, bouts of sneezing, the onset of itchy and watery eyes, a runny nose, or even irritations of the skin.
A response stemming from an intense sensitivity to an antigen. This can manifest in various ways, like a sudden occurrence of hives or swelling of the face and throat after exposure to a substance the person is allergic to.