Abdominal bloating and frequent bowel movements may be caused by irritable bowel syndrome, ulcerative colitis, rectal cancer and other diseases. 1. Irritable bowel syndrome: the cause is still unclear, mostly due to psychological, food, intestinal infections and other factors play a role in each other, after the onset of the disease, the patient may often appear abdominal discomfort or abdominal pain, and there will be defecation abnormality, manifested as diarrhea, constipation, or diarrhea and constipation alternately, leading to frequent bowel movements, which may be accompanied by abdominal distension. 2. Ulcerative colitis: the cause of the disease is not clear, mostly due to the interaction with environment, genetics, intestinal micro-ecology and other factors, patients may have repeated episodes of diarrhea, which leads to frequent bowel movements and is accompanied by abdominal pain, abdominal distension, nausea and other symptoms. 3. Rectal cancer: there is no obvious symptom in the early stage of rectal cancer, but as the disease progresses, patients may have frequent bowel movement due to the pressure of tumor on the anus, and there is a feeling of falling in the anus before bowel movement, and when the cancer invades and causes narrowing of intestinal tubes, the patients may also have abdominal pain, abdominal distension and other symptoms. In addition, there are other reasons that can cause abdominal distension and frequent bowel movements, so it is recommended to go to the hospital in time to find out the cause of the disease and follow the doctor’s instructions to standardize the treatment.