Normal Urge to Defecate
The need to have a bowel movement is first marked by an urging. This sensation compels a person to find suitable toilet facilities so that defecation can occur. There are a number of reasons why this sensation occurs including :
- Stretching of the wall of the colon as waste and water accumulates in it.
- Increased pressure within the abdomen (intra-abdominal pressure).
- Defecation reflexes which are stimulation of the bowels by nerve signals.
- Filling of the rectum with feces.
These triggers for the defecation urge is considered normal. It occurs on daily basis for most people and facilitates the process of stool evacuation. The rectum fills with stool and the external and internal anal sphincters relax allowing stool to pass out into the environment. Once all of the stool in the rectum has been passed out, the defecation urge sensation subsides completely.