Stool gets hard and dry when the large intestine (colon) takes in (absorbs) too much water.

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

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

Once a child becomes constipated, the problem can quickly get worse. Hard, dry stools can be painful to push out. So the child may stop using the bathroom because it hurts. Over time, the colon will not be able to sense that stool is there.

There are many reasons why a child may become constipated. Some common diet and lifestyle causes include:

Symptoms can occur a bit differently in each child. They may include:

• Not having a bowel movement for a few days
• Passing hard, dry stools or blood-streaked stools
• Having belly (abdominal) bloating, cramps, or pain
• Not feeling hungry
• Showing signs of trying to hold stool in, such as clenching teeth, crossing legs, squeezing buttocks together, turning red in the face
• Small liquid or soft stool marks on a child's underwear

The symptoms of constipation can be like other health conditions. Make sure your child sees a healthcare provider for a diagnosis.

The healthcare provider will ask about your child’s symptoms and health history. The provider will give your child a physical exam. Depending on how old your child is, you might be asked questions, such as:

• How old was your baby when they had their first stool?
• How often does your child have a bowel movement?
• Does your child complain of pain when having a bowel movement?
• Have you been trying to toilet train your toddler lately?
• What foods does your child eat?
• Have there been any stressful events in your child's life or your family's situation lately, such as divorce or death?
• How often does your child poop in their pants?

Your child’s provider may also want to do some tests to see if there are any problems. Some of these tests involve the most intimate areas of a child's body. So make sure you explain the procedures to your child and answer any questions in an age-appropriate manner beforehand. These tests may include:

• Digital rectal examination. Your child’s healthcare provider puts a gloved, greased (lubricated) finger into your child’s rectum. The provider will feel for anything abnormal.
• Abdominal X-ray. This test checks how much stool is in the large intestine.
• Barium enema. This is an X-ray exam of the rectum, the large intestine, and the lower part of the small intestine. Your child will be given a metallic fluid called barium. Barium coats the organs so they can be seen on an X-ray. The barium is put into a tube and inserted into your child’s rectum as an enema. An X-ray of the belly will show if your child has any narrowed areas (strictures), blockages (obstructions), or other problems.
• Anorectal manometry. This test checks the strength of the muscles in the anus and the nerve reflexes. It also checks your child’s ability to sense that the rectum is full (rectal distension) and a bowel movement is needed. And it looks at how well the muscles work together during a bowel movement.
• Rectal biopsy. This test takes a sample of the cells in the rectum. They are checked under a microscope for any problems.
• Sigmoidoscopy. This test checks the inside of part of the large intestine. It helps to find out what is causing diarrhea, belly pain, constipation, abnormal growths, and bleeding. A short, flexible, lighted tube (sigmoidoscope) is put into your child’s intestine through the rectum. This tube blows air into the intestine to make it swell. This makes it easier to see inside.
• Colorectal transit study. This test shows how well food moves through your child’s colon. The child swallows pills (capsules) filled with small markers that can be seen on an X-ray. The child eats a high-fiber diet for the next few days. X-rays will be taken 3 to 7 days after your child takes the pills. The X-rays will show how the pills moved through the colon.
• Colonoscopy. This test looks at the full length of the large intestine. It can help check for abnormal growths, red or swollen tissue, sores (ulcers), and bleeding. The test uses a long, flexible, lighted tube (colonoscope). The tube is put into your child’s rectum up into the colon. This tube lets the healthcare provider see the lining of the colon and take out a tissue sample (biopsy) to test it. The provider may also be able to treat some problems that are found.
• Lab testing. Several tests may be done. These include tests to check for issues, such as celiac disease, a urinary tract infection, thyroid problems, metabolic problems, and blood lead level.

Treatment will depend on your child’s symptoms, age, and general health. It will also depend on how severe the condition is. Your child may need to see a pediatric gastroenterologist. This healthcare provider specializes in treating children who have constipation.

Treatment may include diet and lifestyle changes, such as:

Hard stools can irritate or tear the lining of the anus (anal fissures). This makes it painful to have a bowel movement and may cause mild amounts of bleeding. Your child may avoid having a bowel movement because it hurts. This can make constipation worse.

Constipation can be prevented by figuring out the times when it may occur and making changes.

For instance, when babies start to eat solid food, constipation can result. This is because they don’t have enough fiber in their new diet. You can add fiber to your baby’s diet by giving pureed vegetables and fruits. Or try whole-wheat or multigrain cereals.

Constipation can also happen during toilet training. Children who do not like using a regular toilet may hold in their stool. This causes constipation.

All children should get the right amount of fiber and fluids. Other preventive measures include making sure your child has:

• Regular access to a bathroom
• Enough time to use the toilet
• Regular physical exercise

The same changes that can help treat constipation may also help to stop it from happening.

Constipation can be either short-term (acute) or long-term (chronic). Children with intestinal diseases may have chronic constipation problems. But in most cases, constipation is a short-term condition. If your child has chronic constipation, work with your child's healthcare provider. In an age-appropriate manner, include your child in treatment discussions and plans. Together you can create a care plan that is correct for your child.