Why Do Some People With Constipation Lose Their Bowel Movement Sensation?

Constipation without the urge to defecate can be a complex issue. Normally, when food waste reaches the large intestine, water is reabsorbed, and once the volume builds up to around 100mL in the rectum, it triggers the sensation of needing to go. This signal is sent to the brain, initiating the bowel movement process. However, defecation is a complex function involving multiple nerves and muscles, and any disruption along this pathway can interfere with normal bowel movements.

In individuals suffering from constipation, intestinal motility tends to slow down. Over time, the rectal sensitivity may decrease, meaning that what used to trigger an urge—like 100mL of stool—now requires a much larger volume to produce the same sensation. As a result, the urge to defecate becomes noticeably weaker or even absent.

One important recommendation for managing constipation is to not suppress the natural urge to go. When a person feels the need to defecate, it's best to respond promptly rather than delay. Establishing a consistent bathroom routine in the morning can help regulate bowel habits, as gastrointestinal motility naturally increases during this time. Developing and maintaining healthy bowel habits is essential for long-term digestive wellness.

Additionally, lifestyle changes such as increasing fiber intake, staying hydrated, and engaging in regular physical activity can support more regular bowel movements. Ignoring persistent symptoms may lead to worsening constipation and other complications, so seeking medical advice when necessary is also encouraged.