The abdominal pain of colitis is usually dull pain or colic, often located in the left lower abdomen or lower abdomen. Other manifestations include loss of appetite, abdominal distension, nausea, vomiting, and hepatomegaly; there may be tenderness in the left lower abdomen, and sometimes the spasmodic colon can be touched. Common systemic symptoms include weight loss, fatigue, fever, anemia, etc. In a small number of patients, the condition suddenly worsens during the chronic course of the disease or is explosive at the first onset, with severe diarrhea, 10-30 times a day, and stool containing blood, pus, and mucus, as well as high fever, vomiting, tachycardia, exhaustion, dehydration, electrolyte imbalance, coma, and even colon perforation. If not treated in time, it can cause death.