Incomplete Evacuation | Feeling of Incomplete Bowel Emptying

A persistent feeling that bowel movements are incomplete - that stool remains even after passing - is called incomplete evacuation or tenesmus. It is a clinically important symptom because it can indicate a structural cause (hemorrhoids, rectal prolapse, rectal cancer) or a functional cause (obstructed defecation syndrome, IBS). It always warrants evaluation when persistent.

Incomplete evacuation is one of the most common anorectal complaints in clinical practice - and one of the most frequently dismissed. Many patients describe it as "I always feel like there's something still there" or "I go to the toilet but never feel fully emptied." This persistent sensation has a wide range of causes, and identifying the underlying cause determines the treatment.

Causes of Incomplete Evacuation

• Internal hemorrhoids (most common) - prolapsed internal hemorrhoids create a sensation of fullness or incomplete emptying even when the rectum is empty; the hemorrhoidal tissue is perceived as a foreign body
• Obstructed defecation syndrome - paradoxical puborectalis contraction or rectocele traps stool in the rectum
• Irritable bowel syndrome (IBS) - visceral hypersensitivity produces a perception of incomplete emptying even with normal defecation
• Rectal prolapse - the rectum slides down, leaving the perception of residual rectal content
• Rectal cancer - tumour in the rectum produces persistent tenesmus; weight loss and blood in stool accompany - urgent colonoscopy needed
• Proctitis (rectal inflammation) - from inflammatory bowel disease, infection, or radiation
• Stool consistency issues - loose or very soft stools that are difficult to fully expel from the rectum

Red Flags

Treatment by Cause

• Internal hemorrhoids: Rubber band ligation, sclerotherapy, or hemorrhoidectomy - removes the tissue causing the fullness sensation
• Obstructed defecation syndrome: Biofeedback physiotherapy for paradoxical contraction; surgical repair (STARR procedure or laparoscopic ventral mesh rectopexy) for structural causes
• Rectal prolapse: Surgical repair - laparoscopic mesh rectopexy or perineal procedures
• IBS: Dietary management, soluble fibre, antispasmodics, gut-directed therapy
• Proctitis: Topical steroids or 5-ASA (aminosalicylic acid) preparations; specialist gastroenterology involvement

Frequently Asked Questions