Meaning of the word hypersensitivity in English

What does hypersensitivity mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

hypersensitivity

US /ˌhaɪ.pɚˌsen.səˈtɪv.ə.t̬i/
UK /ˌhaɪ.pə.sens.əˈtɪv.ə.ti/

Noun

a condition in which the immune system reacts in an extreme way to a substance in the body:

Example:
Acute hypersensitivity, resulting in vomiting or diarrhea, can be a reaction to allergies to foods such as nuts or shellfish.