Colitis is divided into various types, such as ulcerative colitis, infectious colitis, ischemic colitis, Crohn’s disease, different types of symptoms are not the same, the common manifestation of abdominal pain, increased frequency of stools, pus and blood stools and so on. 1. Ulcerative colitis: patients may have recurrent diarrhea, and the presence of pus and blood stools, and in severe cases, dehydration, anemia, fever and other manifestations. 2. Infectious colitis: usually caused by pathogenic bacterial infection, the onset of the disease is more acute, which may cause the patient to develop obvious abdominal pain, fever, nausea, vomiting and other symptoms. 3. Ischemic colitis: the probability of appearing in the middle-aged and elderly groups is higher, which can make the patient suddenly appear blood in the stool, abdominal pain, diarrhea and other symptoms, and a few patients will also have intestinal obstruction. 4. Crohn’s disease: mainly manifested as abdominal pain and diarrhea, can also have systemic symptoms such as fever, fatigue, loss of appetite and other symptoms. Others, such as radiation enteritis, eosinophilic gastroenteritis, etc., will also have abdominal pain, diarrhea and other manifestations, when the symptoms of colitis, it is recommended to seek medical examination and treatment as soon as possible to avoid other complications.