5. Vomiting or diarrhea
Hypersensitivity reactions are exaggerated immune responses against a given antigen, and even if they are not related to food or the digestive system, they sometimes trigger digestive symptoms. The most common digestive symptoms in anaphylaxis are vomiting and diarrhea. The reason why vomiting is triggered is because of the inflammatory stress in the body and the release of cytokines to the bloodstream. When they reach the nervous centers that control the gag reflex, patients may start feeling nausea and propensity to start vomiting. Diarrhea is triggered by an inflammatory reaction in the epithelium of the gut, which starts to release water instead of absorbing and leads to watery stools, which may become complicated with dehydration and electrolyte imbalances if not carefully addressed.