Constipation: Common Causes and the Tests That Find Them

Understand what causes constipation and the tests that can help identify the underlying issues.

Sep 13, 2026 3 min read

Constipation is a common digestive issue that affects many people at some point in their lives. It occurs when bowel movements become less frequent and stools become difficult to pass. Understanding the causes of constipation and the tests available to identify them can help you manage this condition effectively.

What is constipation?

Constipation is a condition characterized by infrequent bowel movements or difficulty passing stools. While the frequency of bowel movements can vary from person to person, fewer than three bowel movements a week is generally considered a sign of constipation. The stool may be hard, dry, and painful to pass, and you might feel bloated or have a sensation of incomplete evacuation.

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Common causes of constipation

Constipation can be caused by a variety of factors, including:

  • Dietary habits: A diet low in fiber, which is found in fruits, vegetables, and whole grains, can lead to constipation. Fiber helps to increase the bulk and softness of the stool, making it easier to pass.
  • Lack of physical activity: Regular physical activity helps stimulate intestinal activity, and a sedentary lifestyle can contribute to constipation.
  • Dehydration: Not drinking enough water can lead to hard stools and constipation. Water helps to keep the stool soft and easier to pass.
  • Medications: Certain medications, such as painkillers (especially opioids), antacids containing calcium or aluminum, and some antidepressants, can cause constipation.
  • Medical conditions: Conditions like irritable bowel syndrome (IBS), diabetes, and hypothyroidism can affect bowel movements and lead to constipation.

Tests to identify the cause of constipation

If constipation persists or is accompanied by other symptoms, your doctor may recommend tests to determine the underlying cause. These tests may include:

  • Blood tests: These can help identify conditions like hypothyroidism or diabetes that might be contributing to constipation.
  • Stool tests: A stool sample can be analyzed for signs of infection or inflammation.
  • Colonoscopy: This procedure allows a doctor to examine the entire colon for abnormalities such as blockages or growths.
  • X-rays or CT scans: Imaging tests can help identify obstructions in the intestines or other structural issues.

Frequently asked questions

Is constipation a serious condition? Constipation is usually not serious, but chronic constipation can lead to complications like hemorrhoids or anal fissures. Persistent symptoms should be evaluated by a healthcare professional.

Can stress cause constipation? Yes, stress can affect your digestive system and contribute to constipation. Managing stress through relaxation techniques and exercise may help improve symptoms.

How much fiber should I include in my diet? Aiming for 25-30 grams of fiber per day from foods like fruits, vegetables, and whole grains is generally recommended to help prevent constipation.

When to see a doctor

You should consult a doctor if you experience constipation that lasts more than a few weeks, if you notice blood in your stool, or if you have severe pain or unexplained weight loss. These symptoms could indicate a more serious underlying condition that requires medical attention.

Remember, while this information can help you understand constipation and its causes, any decisions about your health should be made in consultation with your healthcare provider.

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