Enteritis can be categorized into infectious and non-infectious, and some infectious enteritis can be contagious, such as bacillary dysentery. Infectious enteritis is mostly due to fungal, bacterial, viral, parasitic and other pathogen infections; non-infectious enteritis is mainly due to food allergies, drug stimulation, radiation damage; some infectious enteritis can be contagious, such as bacillary dysentery, which can be transmitted through bacterially contaminated food, water, utensils, and it is important to strengthen personal hygiene during treatment to avoid transmitting the disease to others. Enteritis may be complicated by toxic megacolon, intestinal perforation, intestinal obstruction, and when the symptoms are serious, we should actively seek medical treatment to minimize the emergence of complications.