Frequent bowel movement and feeling of incomplete bowel movement in the elderly may be caused by physiological factors, ulcerative colitis, rectal cancer and other diseases. 1. Physiological factors: due to long-term dietary inappropriateness or irregular diet, which leads to changes in defecation habits, frequent bowel movements and feeling of incomplete bowel movements may occur. 2. Ulcerative colitis: Ulcerative colitis in the elderly will stimulate bowel reflexes due to diffuse intestinal inflammation, leading to frequent bowel movements and the feeling of incomplete bowel movements. In addition, patients may also have abdominal pain, mucus, pus and blood stools and other symptoms. 3. Rectal cancer: if the elderly suffer from rectal cancer, the tumor lesion will continue to stimulate the intestinal receptors, which will make the patients have frequent bowel movements and feel incomplete. When the elderly have frequent bowel movements and feel incomplete, they need to go to the hospital in time to find out the cause of the disease, and carry out treatment according to the cause of the disease.