In a nutshell
When the rectum fills, the internal anal sphincter can briefly relax. This involuntary response is part of normal continence control and does not mean that stool must pass immediately.
Why does it happen?
Stretching of the rectum triggers reflex relaxation of the internal sphincter. This allows contents to reach the upper anal canal, where they can be sensed. Meanwhile, the external sphincter and other pelvic-floor structures maintain closure until evacuation is appropriate.
Frequency
Temporary relaxation of the internal sphincter when the rectum is stretched is a normal reflex. It is not a consciously learned ability.
Frequency is a qualitative description, not your individual probability.
Is it normal?
The reflex normally occurs unnoticed; its function cannot be assessed reliably by self-testing.
When to seek advice
New involuntary passage of stool, bleeding, or persistent difficulty emptying the bowel should be medically assessed. Sudden loss of bladder or bowel control with numbness in the saddle area or leg weakness requires immediate emergency medical care.
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Sources (2)
- Anatomie des Analkanals – StatPearls (opens a new tab)
This source supports the description and physiological context of this entry.
- Stuhlinkontinenz – StatPearls (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
