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The most common causes of constipation

Irritable bowel syndrome (IBS). Some people with IBS, also known as
spastic colon, have spasms in the colon that affect bowel movements.
Constipation and diarrhoea often alternate.

Pregnancy.

During pregnancy constipation can occur because of hormonal changes or because of compression of the intestine by the uterus.  Aging may also affect bowel regularity because slower  metabolism results in less intestinal activity and muscle tone.  Changes in life or routine. People often become constipated when travelling because their normal diet and daily routines are disrupted.

Abuse of laxatives.

This is common among people who are obsessed with having a daily bowel movement. Laxatives can become habit-forming. Laxatives act by stimulating the nerve endings in the colon which further stimulate the
colonic movements. However, continuous use of laxatives can damage the
nerve cells in the colon and interfere with the colon’s natural ability to contract and produce bowel movement.

Therefore the dose of the laxative has to be increased frequently to
produce more bowel movements. Ignoring the urge to have a bowel movement.

People who ignore the urge to have a bowel movement may eventually stop feeling the urge, which can lead to constipation. For example, some people delay having a bowel movement because they do not want to use toilets outside the home.

•Specific diseases:  Diseases that cause constipation include neurological
disorders, metabolic and endocrine disorders like diabetes, hypothyroidism, and so on. These disorders can slow the movement of stool through the colon.

•Problems with the colon and rectum. Intestinal obstruction, scar tissue (adhesions), tumors, stricture (localised narrowing of the colon) or cancer can cause constipation.

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