constipation blood test explained

Overview

Constipation means having fewer than three bowel movements a week, or passing hard, dry stools that are difficult or painful to pass. A blood test for constipation is a simple test that checks for health problems that might be causing your constipation, such as low thyroid function or high calcium levels.

Yes, constipation is very common. About 1 in 7 adults and 1 in 3 children experience it at some point.

Constipation can affect people of all ages, but it is more common in older adults, pregnant women, and people with certain medical conditions.

Symptoms

Common symptoms

• Having fewer than three bowel movements per week
• Stools that are hard, dry, or lumpy
• Straining or pain when passing stool
• Feeling like you haven't completely emptied your bowels
• Needing to press on your belly or use a finger to help pass stool

Symptoms in children

• Soiled underwear (leakage of liquid stool)
• Pain when pooping
• Withholding stool (clenching buttocks or crossing legs)
• Irritability or loss of appetite

Symptoms in older adults

• Longer time between bowel movements
• Hard stools that are difficult to pass
• Increased risk of fecal impaction (a hard blockage that can't be passed)
• Confusion or urinary symptoms as a result of severe constipation

Causes

Main causes

• Not eating enough fiber (from fruits, vegetables, and whole grains)
• Not drinking enough water
• Lack of physical activity
• Ignoring the urge to have a bowel movement
• Side effects of certain medications (such as painkillers, antidepressants, or iron supplements)
• Medical conditions like hypothyroidism (underactive thyroid), diabetes, or irritable bowel syndrome

Risk factors

• Being older in age
• Being pregnant
• Eating a diet low in fiber
• Not drinking enough fluids
• Taking medications that cause constipation
• Having a medical condition that affects digestion or hormones

When to see a doctor

See a doctor urgently if:

• If you have severe belly pain, vomiting, or cannot pass gas or stool (call emergency services).
• If you see blood in your stool or bleeding from your rectum.

Book a routine appointment if:

• If constipation lasts more than three weeks despite trying home treatments.
• If you have a sudden change in your bowel habits that doesn't go away.
• If you have a family history of colon cancer or other digestive conditions.

Diagnosis

A doctor will talk to you about your symptoms, medical history, and do a physical exam. They may press on your belly and sometimes do a rectal exam. If they suspect an underlying condition, they may order a blood test.

Tests that may be done

• Blood test – checks for thyroid function, calcium levels, blood count, and signs of inflammation.
• Stool test – checks for blood or signs of infection.
• Colonoscopy or sigmoidoscopy – a camera to look inside your colon (only if needed).
• X-rays or CT scans – to see if there is a blockage.

What to expect at your appointment

A blood test for constipation is quick and simple. A healthcare professional will take a small sample of blood from your arm using a needle. You might feel a slight pinch. Results usually come back in a few days, and your doctor will discuss them with you.

Treatment

Treatment for constipation depends on the cause. Often, lifestyle changes are enough. If there is an underlying condition, treating that condition usually improves the constipation. Your doctor can recommend safe over-the-counter remedies or prescribe medications if needed.

Self-care at home

• Eat more high-fiber foods like fruits, vegetables, beans, and whole grains.
• Drink plenty of water – aim for 6 to 8 glasses a day.
• Get regular physical activity, like walking.
• Don't ignore the urge to have a bowel movement.
• Sit on the toilet at the same time each day to establish a routine.

Medical treatments

If self-care is not enough, your doctor may suggest laxatives or stool softeners available without a prescription. Use these only as directed and for a short time. For chronic constipation, doctors have prescription medications that work differently in the body. Always talk to your healthcare provider before starting any new medication.

When is surgery considered?

Surgery is rarely needed for constipation. It may be considered only if there is a physical blockage, a structural problem, or if all other treatments have failed.

Living with this condition

Live with constipation by creating habits that help your body stay regular. Keep a bathroom routine, manage stress, and note what foods or activities help.

Lifestyle tips

• Stay active – aim for at least 30 minutes of moderate exercise most days.
• Set aside time each day for a bowel movement, especially after meals.
• Manage stress through relaxation techniques like deep breathing or meditation.

Diet and exercise

Eat a diet rich in fiber from fruits, vegetables, whole grains, and legumes. Drink plenty of water. Regular exercise like walking, swimming, or yoga helps stimulate your bowels.

Mental health and emotional wellbeing

Constipation can be frustrating and uncomfortable. It may cause embarrassment or anxiety. These feelings are normal. Stress can also make constipation worse. Talk to your doctor if it affects your quality of life.

Prevention

Yes, many cases of constipation can be prevented with a healthy lifestyle – eating high-fiber foods, drinking enough water, and staying active.

Screening programmes

Screening for bowel cancer is recommended for people aged 50 and over (or earlier if you have risk factors). Constipation alone is not a sign of cancer, but a change in bowel habits should be discussed with your doctor.

Complications

If left untreated

• Hemorrhoids (swollen veins in the rectum)
• Anal fissures (small tears in the skin around the anus)
• Fecal impaction (a hard mass of stool that blocks the bowel)
• Rectal prolapse (part of the rectum slips outside the anus)

Long-term outlook

For most people, constipation is easily managed with simple lifestyle changes. Even when it is caused by an underlying condition, treating that condition usually resolves the constipation. With the right help, you can get back to regular, comfortable bowel movements.

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