Although it is unknown what causes most types of vasculitis, immune system abnormality, inflammation of blood vessels, and genetic factors appear to be somewhat important in the cause of the disease. Vasculitis can also be caused by an immune or allergic reaction in the vessel walls.
Allergic reaction: The hypersensitive response of the immune system of an allergic individual to a substance. When an allergen enters the body, it causes the body's immune system to develop an allergic reaction in a person with an allergy to it. This reaction can occur when the immune system attacks a normally harmless substance (the allergen). The immune system calls upon a protective antibody called immunoglobulin E or IgE to fight these invading substances.
drug allergy, or an allergic drug reaction, is an unexpected drug. reaction that results from a specific immune system response. to a medication. Past tolerance to a medication is no guarantee that. treatment with that drug will not cause an allergic reaction next time.People who who have allergies have a higher risk of drug reactions. Certain families may have a higher than normal risk of drug reactions.ast tolerance to a medication is no guarantee that. treatment with that drug will not cause an allergic reaction next time. People who who have allergies have a higher risk of drug reactions.