Your stool gets hard and dry when your colon (large intestine) absorbs (soaks up) too much water.

In most cases, as food moves through your colon, the colon absorbs water while it makes stool. Muscle movements (contractions) push the stool toward your rectum. When the stool gets to the rectum, most of the water has been soaked up. The stool is now solid.

If you have constipation, your colon's muscle movements are too slow. This makes the stool move through your colon too slowly. The colon absorbs too much water. The stool gets very hard and dry.

Some of the most common diet and lifestyle causes of constipation are:

• Not getting enough exercise
• Not drinking enough liquids
• Not eating enough fiber
• Not moving your bowels when you feel the urge to
• Changes in your lifestyle, such as travel, pregnancy, and old age

Other causes of constipation include:

• Medicines
• A problem with how your stomach and bowels work (such as irritable bowel syndrome)
• Your intestine does not work well
• Metabolic problems, such as thyroid disease
• Intestinal blockage

Each person’s symptoms may vary. Symptoms of constipation may include:

• Difficult and painful bowel movements
• Less than 3 bowel movements a week
• Feeling bloated
• Belly (abdominal) pain or discomfort
• Ineffective straining to move your bowels

Many of these symptoms may be caused by other health problems. Always talk with your healthcare provider to be sure.

Most people have constipation at one time or another. To see if you have constipation, your healthcare provider will do several tests. These tests will depend on how long you have had symptoms and how serious your case is.

First your healthcare provider will look at:

• Your age
• If you have any blood in your stool
• Any changes in your bowel habits
• Weight loss

Your provider will likely:

• Ask about your past health. You will be asked to give details about your constipation, such as how long you have had symptoms and how often you have bowel movements.
• Give you a physical exam. Your healthcare provider will do a full physical exam.
• Give you a digital rectal exam. This exam helps tell if the area is soft, blocked, or bloody. It can also check how much and what kind of stool you have. Your provider will also see if your rectum is bigger than normal. And they'll check the anal sphincters (muscles).

You may also need other tests, such as:

• Abdominal X-ray. This X-ray test can show the fullness of the bowels.
• Blood work. Blood is taken for testing.
• Lower GI series (also called barium enema). This is an X-ray exam of your rectum, the large intestine, and the lower part of your small intestine. You will be given a fluid called barium. It coats the organs, so that they can be seen on an X-ray. An X-ray of your belly will show if you have any narrowed areas (strictures), blockages, or other problems. An X-ray of the area around the anus and rectum (called a defecogram) may be done to see how well you can hold and release stool. .
• Colonoscopy. This test looks at the full length of your large intestine. It can help check for any abnormal growths, tissue that is red or swollen, sores (ulcers), or bleeding.
• Sigmoidoscopy. This test lets your healthcare provider check the inside of part of your large intestine. It helps to tell what is causing constipation.
• Colorectal transit study. This test shows how long it takes for food to move through your colon. You will be asked to swallow pills (capsules) filled with small markers that can be seen on an X-ray. The X-rays will show how the capsules moved through your colon.
• Anus and rectum (anorectal) function tests. These tests can tell if you are constipated because your anus or rectum is not working well.

Your healthcare provider will come up with a care plan for you based on:

• Your age, overall health, and past health
• How serious your case is
• How well you handle certain medicines, treatments, or therapies
• If your condition is expected to get worse
• Your opinion and what you want to do

In most cases, diet and lifestyle changes can help reduce constipation symptoms. They can also stop it from happening. These changes may include:

• Drinking more water and juice.
• Getting regular exercise.
• Giving yourself time to have a bowel movement each day. Sitting for 10 minutes after meals can be helpful.
• Eating more fiber. If you don't eat enough fiber, add a fiber supplement.
• Taking laxatives. Your provider can discuss your choices.
• Stopping or changing medicine.
• Add a footstool in front of your toilet to raise your legs. This puts you in a better position to move your bowels.
• Doing physical therapy with or without biofeedback (part of a special physical therapy program).

Constipation can cause other health problems, such as:

• Hemorrhoids. Red, swollen veins in the rectum. They happen when you need to keep straining to have a bowel movement.
• Anal fissures.  Tears in the skin around the anus. They happen when hard stool stretches your sphincter muscle. They can cause bleeding in your rectum.
• Rectal prolapse.  This is when a small amount of your intestinal lining pushes out from your anal opening. It is caused by straining to have a bowel movement.
• Fecal impaction. This is when a large lump of hard, dry stool stays stuck in your rectum. The colon’s normal pushing action can’t push out the stool. This is seen mostly in children and older adults.

Many of the same lifestyle changes that help treat constipation may also help to stop it from happening:

• Have plenty of fiber, water, and liquids each day.
• Get daily regular exercise. Adults should do 150 minutes (2 hours and 30 minutes) of moderate intensity exercise every week. If you are new to exercise, this can be broken down into 10-minute periods of activity during the day. Daily movement activities, such as walking, gardening, house cleaning. count. They can make a big difference in how you feel.
• Allow plenty of time for bowel movements. When you feel the urge to have a bowel movement, be sure to do it.
• Try to have a bowel movement at the same time each day.
• If another health problem makes you more likely to have constipation, take your provider’s advice for treating that problem.