Generally after suffering from colitis, will directly cause the patient diarrhea, in fact, diarrhea is a lot of gastrointestinal disease **** with one of the symptoms, the symptoms of colitis specifically include: 1. Diarrhea and mucus pus blood stool. Seen in the absolute majority of patients. Diarrhea soil to be with inflammation. To the human intestinal mucosa to sodium absorption obstacles and colonic dysfunction, mucus pus blood in the feces for inflammation exudation, mucosal erosion and ulceration. Mucopurulent blood is an important manifestation of the active stage of the disease.2. Abdominal painMild patients may have no abdominal pain or only abdominal discomfort. Generally complain of mild to moderate abdominal pain, mostly paroxysmal pain in the left lower abdomen or lower abdomen, can also involve the whole abdomen. There is a pattern of pain relieved after the bowel movement, and there is often a sense of urgency and heaviness. If the complication of toxic megacolon or inflammation spread to the peritoneum, there is persistent severe abdominal pain.3. Signs and symptoms of light and medium-sized patients only have light pressure pain in the left lower abdomen, and sometimes the spastic descending colon or sigmoid colon can be touched. Severe and fulminant patients often have obvious pressure pain and bulging bowel. If there is abdominal muscle tension, rebound pain, intestinal whining sound weakening should pay attention to scarf toxicity minister colon, intestinal perforation and other complications.4. Other symptoms may be abdominal distension, severe cases have loss of appetite, nausea, vomiting.