Hypersensitivity is due to allergies.
A combination of interactions between a drug, your immune system, and viruses in your body, particularly herpes viruses, result in hypersensitivity syndrome.
The term "allergy" is frequently used to describe a hypersensitive reaction. An abnormal reaction to foreign substance is referred to as a hypersensitive reaction. To this antigen, the body can launch one of four distinct immunological reactions. Anything from a dish to a medicine might serve as the antigen.
Hypersensitivity diseases include autoimmune diseases, in which immune responses are directed against self-antigens, and diseases that result from uncontrolled or excessive responses to foreign antigens.
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