Why people enjoy eating hot peppers?.

There are pain receptors called trigeminal cells located throughout the mouth, the nose and the throat. Capsaicin irritates these cells sending pain signals to the brain. The brain responds by releasing endorphins giving a  feeling of euphoria. Body also responds with increase of heart rate, metabolism, mouth salivation, and sweating; nose starts to run. Basically, it results in a sensation of well being.