Allergic enteritis refers to allergy-induced intestinal dysfunction, usually with symptoms such as abdominal pain, diarrhea and constipation. 1. Abdominal pain: mainly persistent dull pain in the left lower abdomen, lasting a few minutes to a few days, relieved after defecation. 2. Diarrhea: usually mushy stools, some patients may have loose stools with a frequency of 2~6 times/day or even more, sometimes accompanied by bloody stools. 3. Constipation: some patients have diarrhea accompanied by constipation, which is manifested as difficulty in defecation and dry stools. Allergic enteritis patients should avoid contact with allergens, pay attention to maintaining optimism, avoiding fatigue, regular work and rest. If necessary, you can take oral cetirizine hydrochloride and other anti-allergy drugs to treat allergies. Once allergic enteritis patients have symptoms, it is recommended to go to the regular hospital in time, under the guidance of the doctor to standardize the treatment.