There are no obvious symptoms in the early stage of colitis, and some people may show symptoms such as diarrhea, abdominal pain, and a sense of urgency and heaviness, which varies from person to person. Colitis refers to various causes of inflammatory lesions in the colon, the cause of which is still unclear, and may be related to genetic factors, infectious factors, immune factors, environmental factors, neurological factors and so on. There are no obvious symptoms in the early stage of colitis, and some people may suffer from abdominal pain, diarrhea, mucus, pus and blood in the stools, a feeling of urgency and heaviness, frequent bowel movements, a feeling of incomplete bowel movements, or constipation or diarrhea and constipation alternately, which may be accompanied by weight loss, fatigue, etc., and often recurring episodes. The occurrence of the above symptoms should be taken seriously, and timely consultation should be made to identify the cause of the disease and follow the medical advice for further treatment or therapy.