Men with lower abdominal distension with a feeling of defecation, consider and colitis, bacillary dysentery, constipation and other factors. 1. colitis: colitis is a variety of factors lead to inflammatory lesions of the colonic mucosa. Inflammation of the mucosa of the colon can cause diarrhea and abdominal pain, acute and severe, mucus, pus and blood stools, resulting in the patient’s lower abdominal distension, always have a sense of defecation. 2. Bacterial dysentery: the cause of bacterial dysentery is relatively clear, for Shigella infection caused by intestinal infections. After the incubation period, the patient may have nausea and vomiting, diarrhea and abdominal pain, mucus, pus and blood stools, will produce obvious lower abdominal pain, a sense of urgency and heaviness. 3. constipation: constipation, stool blockage of the anus, will cause local stimulation to produce the urge to stool, but also accompanied by abdominal distension and pain and other symptoms, the symptoms can be effectively relieved after defecation. Men with normal lower abdominal distension with a sense of defecation, but also to understand whether the irritable bowel syndrome, ulcerative colitis, Crohn’s disease and other diseases, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for targeted treatment.