Why Eating Spicy Food Can Give You Diarrhea
The presence of a substance called capsaicin, which is present in foods like chili and pepper, is one of the reasons why so many of us have trouble eating spicy food.
Eating spicy food passes through the stomach, which contains multiple parts, on its route to our mouths. Consuming capsaicin activates a protein called vanilloid receptor 1, which subsequently alerts our brains that we are internally burning. In an effort to comprehend what is happening, the brain starts to release endorphins, which are the body's natural painkillers.
Moreover, the small intestine quickly pushes the capsaicin through the gut in order to defend your body against what it perceives as harmful. Digestion often slows down, and the colon absorbs water when food enters the colon. However, capsaicin also causes those receptors to activate. The colon speeds up the entire process as protection, forcing us to race to the bathroom while having diarrhea.
People occasionally experience a burning sensation in their anus as a parting gift. This is so because the anus contains a greater number of these pain receptors.
Source: very well health