肠胃炎是以胃和小肠炎症为特征的胃肠道病症，可导致腹泻、呕吐、腹部的疼痛和绞痛合并而成疾病表现。虽然与流感并无关系，但该病也被称为肠胃型感冒和消化道流感。 全球大部份儿童的肠胃炎是因为受到轮状病毒感染。成年人则以轮状病毒和弯曲杆菌感染为主，其他原因包括不同的细菌或细菌毒素，与及寄生虫。感染途径是进食不洁食物或饮用污染的水，或近距离接触病人。

治疗以充分补水为基础。对于轻度或中度病例，可通过口服补液溶液来完成。对于更为严重的病例，可能需要静脉补液。肠胃炎的主要患病人群是儿童和发展中国家的人们。 食欲不振，感觉不到饥饿。

Gastroenteritis, also known as infectious diarrhea, is inflammation of the gastrointestinal tract that involves the stomach and small intestine. Signs and symptoms include some combination of diarrhea, vomiting, and abdominal pain. Fever, lack of energy, and dehydration may also occur. This typically lasts less than two weeks. It is unrelated to influenza though it has been called the stomach flu.