Colitis usually does not have the symptom of constipation, but it is easy to have the symptom of bleeding. Common colitis includes ulcerative colitis, infectious colitis, Crohn’s disease and so on. 1. Ulcerative colitis: patients with ulcerative colitis may have diarrhea, mucus, pus and blood stools, that is, there will be bleeding, but not constipation, patients with the disease will also have fever, acute and severe (lower abdominal discomfort, wanting to relieve the stool, after defecation, there is a sense of bowel movement), abdominal pain, abdominal pain relieved after defecation and other symptoms. 2. Infectious colitis: patients with mild infectious colitis only show symptoms of abdominal pain, diarrhea, watery stools, mucus-like stools, no constipation, bleeding, severe infections can appear fever, abdominal pain, diarrhea, mucus, pus, blood, and the symptoms of the stool. 3. Crohn’s disease: Crohn’s disease is a chronic inflammatory granulomatous disease that occurs in the terminal ileum and adjacent colon, which can lead to diarrhea, mushy stools, bloody stools without constipation, and the patient may also have fever, abdominal pain and other symptoms. In addition to the above diseases, ischemic colitis, pseudomembranous colitis and other types of colitis can also lead to diarrhea, blood in the stool, but usually not constipation, if the patient has the above symptoms related to colitis, it is recommended to consult a doctor in a timely manner, and ask the doctor to be disposed of.