Mild colitis usually has ulcerative colitis, ischemic colitis, pseudomembranous colitis, etc. Clinical manifestations usually have diarrhea, bloody stools, abdominal pain, fever and so on. 1. Ulcerative colitis: it is usually caused by heredity, poor dietary structure, immune imbalance, etc. The common clinical manifestations include diarrhea, mucous bloody stools, abdominal pain and so on. 2. Ischemic colitis: mostly occurs in the elderly, usually with intermittent abdominal cramps, blood in stool, diarrhea and other clinical manifestations. 3. Pseudomembranous colitis: after taking a large amount of broad-spectrum antibiotics, it may lead to pseudomembranous colitis, which usually has a large number of watery stools in green or egg-like color and is accompanied by abdominal pain, fever, abdominal distension and other symptoms. The appearance of the above manifestations, it is recommended to clarify the specific type of colitis treatment under the guidance of a doctor, to avoid taking medication on their own to treat the situation, such as medication is not appropriate, causing adverse consequences.