What causes the feeling of incomplete bowel evacuation?

Generally, a sensation of incomplete bowel evacuation may be related to improper diet, unhealthy lifestyle habits, irritable bowel syndrome (IBS), hemorrhoids, rectal prolapse, and other factors. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under the guidance of a qualified physician. Specific analyses are as follows:

1. Improper Diet

Long-term consumption of a low-fiber diet may lead to insufficient fiber intake, resulting in dry, hardened stools and difficulty or incomplete defecation. It is advisable to increase dietary fiber intake by consuming more vegetables, fruits, and whole grains. Regular physical activity should also be maintained to promote intestinal motility, thereby facilitating smooth bowel movements and supporting overall gut health.

2. Unhealthy Lifestyle Habits

Prolonged sitting and lack of physical activity can impair intestinal motility and reduce the propulsive force of the intestines, causing feces to remain in the intestine for extended periods. This leads to excessive water absorption and may result in constipation or incomplete evacuation. Increasing daily physical activity—such as walking or jogging—and engaging in regular exercise, along with establishing consistent routines, can help prevent prolonged sedentary behavior and support healthy digestion.

3. Irritable Bowel Syndrome (IBS)

The pathogenesis of IBS is complex and may involve immune responses following intestinal bacterial infections, leading to disordered intestinal motility. In such cases, stool may be expelled before adequate absorption, creating a persistent sensation of incomplete evacuation. Symptoms may also include abdominal pain and alternating episodes of diarrhea and constipation. Patients may follow medical advice to use medications such as pinaverium bromide tablets, compound diphenoxylate tablets, or mosapride citrate tablets for treatment.

4. Hemorrhoids

Hemorrhoids are primarily caused by long-term poor bowel habits—such as spending excessive time on the toilet or straining during defecation—as well as frequent consumption of spicy and irritating foods. These factors can lead to congestion and swelling of the venous plexus in the anal region, gradually forming hemorrhoids, which may intensify the feeling of incomplete evacuation. Treatment options may include hemorrhoidectomy under medical supervision, involving surgical removal of hemorrhoidal tissue and interruption of its blood supply.

5. Rectal Prolapse (Rectocele)

Rectal prolapse is mainly influenced by factors such as childbirth and aging. These contribute to a forward protrusion of the anterior rectal wall, altering the angle between the rectum and anus. This anatomical change can obstruct stool passage, potentially causing a sensation of incomplete defecation. Under medical guidance, patients may use medications such as lactulose oral solution, hydrocortisone tablets, or chlorhexidine benzocaine lozenges for symptom management.

Maintaining a balanced diet combined with moderate physical activity can enhance intestinal motility and effectively support gastrointestinal health. Adopting such healthy lifestyle habits helps prevent bowel-related issues and promotes optimal functioning of the entire digestive system.