There is always a feeling of incomplete stool at the anus, which may be caused by sinusitis, hemorrhoids, enteritis, rectal malignant tumors and so on. 1. Sinusitis: chronic inflammation of the anal valve and sinuses, local mucous membrane redness, swelling, oozing, can irritate the anus leading to anal swelling, bowel movement. 2. Hemorrhoids: Repeated prolapse of hemorrhoids can lead to localized rupture, swelling, and irritation of the anus resulting in a feeling of constipation and a feeling of incomplete bowel movement. 3. Enteritis: congestion and edema of the intestinal mucosa or even erosion and ulceration can lead to increased frequency of bowel movements and unshaped stools, accompanied by symptoms of rectal irritation. 4. Rectal malignant tumors: rectal tumor erosion, ulceration, can lead to bowel movement with a sense of incomplete stool, accompanied by dark red blood stool. There is always a need to consult a doctor in time to clarify the specific cause of the disease and timely treatment to avoid delaying the condition.