Question: How do doctors find the cause of constipation in children?
Answer: Doctors use your child’s medical and family history, a physical exam, or medical tests to diagnose and find the cause of constipation.

Medical and family history

Your child’s doctor is likely to ask questions about lifestyle habits and symptoms, such as

How often does your child have abowel movement?
How long has your child had symptoms?
What do your child’sstoolslook like?
Do your child’s stools have red streaks in them?
Are there streaks of blood on the toilet paper when he or she wipes?
What is your child’s daily routine, including potty training, physical activity, and day care?
What are your child’s eating habits?
What medicines does he or she take?

You may want to track your child’s bowel movements and what his or her stools look like for several days or weeks before the doctor’s visit. Write down or record the information so you can share it with the doctor.

Physical exam

During a physical exam, a doctor may

check your child’sblood pressure, temperature, and heart rate
check fordehydration
use a stethoscope to listen to sounds in your child’sabdomen
check your child’s abdomen forswellingtenderness or painmasses, or lumps
swelling
tenderness or pain
masses, or lumps
perform arectal exam
Question: What medical tests do doctors use to find the cause of constipation in children?
Answer: Doctors don’t normally need medical tests to diagnose constipation in children. However, in some cases, your child’s doctor may use medical tests to help find the cause of constipation.

Lab tests

Your child’s doctor may look for signs of certain diseases and conditions that may be causing your child’s constipation or are related to your child’s constipation. The doctor may use one or more of the following lab tests.

Blood testscan show signs ofanemia,hypothyroidism, andceliac disease.
Stool testscan show the presence of blood and signs of infection and inflammation.
Urine testscan show signs of conditions such asbladder infections, which could be caused by constipation.

Bowel function tests

If your child’s constipation doesn’t improve with nutrition changes, your child’s doctor may use bowel function tests, including colorectal transit studies. These tests help a doctor see how well stool moves through your child’s colon.

Imaging tests

In some cases, your child’s doctor may use imaging tests of your child’s abdomen to look for problems that may be causing his or her constipation. Imaging tests include

ultrasound
x-rays
computed tomography (CT) scan

Read about medical tests that doctors may use to find the cause of constipation in older children.

Other tests

Your child’s doctor may suggest a rectal biopsy. The rectal biopsy is the best test to diagnose or rule out Hirschsprung disease. A rectal biopsy is a procedure that involves taking small pieces of tissue from the rectum and examining them with a microscope. The doctor will look at the tissue for signs of medical problems.