Enteritis is primarily a disease of the intestines, with a higher incidence in autumn and summer, predominantly manifesting as acute enteritis during these times. The incubation period ranges from 12 to 36 hours, and the main symptoms may cause the patient to experience diarrhea, nausea, and vomiting.

There is also chronic enteritis, which occurs more slowly and causes repeated episodes of abdominal pain over a long period, including diarrhea and various degrees of indigestion. Changes can also be observed in the stool, which may be watery or mucus-laden. Patients with mild diarrhea might defecate three to four times a day. There might be alternating episodes of constipation and diarrhea. In severe cases, patients might experience bowel movements once every one to two hours, or even suffer from severe fecal incontinence. Sometimes, the stool might contain a large amount of mucus and possibly pus and blood, or even fresh blood, which necessitates ruling out other diseases. If enteritis is well-managed, it can be a long time before a recurrence, but if the treatment is not thoroughly standardized, enteritis is likely to recur.