constipation on one side

Overview

Constipation on one side is a symptom rather than a disease. It means you feel constipation or difficulty passing stool that seems to be worse or felt mainly on one side of your lower belly. This can happen because of how the colon is shaped or positioned, or because of a problem like a stool blockage or muscle spasm in that area.

Yes, many people experience episodes where constipation seems to be felt more on one side. It is a common reason for doctor visits and can affect anyone.

It can affect people of all ages, but it is more common in adults, especially those over 60. Women report it more often than men, possibly due to differences in bowel anatomy and hormones.

Symptoms

Common symptoms

• Feeling of fullness or pressure on one side of the lower abdomen
• Infrequent bowel movements (fewer than three times a week)
• Straining during bowel movements
• Hard, lumpy, or dry stools
• Sensation that you cannot completely empty your bowels
• Pain or cramping on one side that may ease after passing stool

Symptoms in children

• Holding back stools due to fear of pain
• Soiling or staining in underwear (faecal incontinence) because of a stool blockage
• Pain on one side that the child points to, often after eating

Symptoms in older adults

• The same typical symptoms, but often made worse by medicines (like painkillers or iron supplements)
• Reduced mobility and slower digestion
• Inability to feel the urge to go, leading to a build-up on one side

Causes

Main causes

• Slow movement of stool in a particular segment of the colon (colonic inertia on one side)
• Spasm of the muscles in the large intestine (also called segmental spasm)
• Stool getting stuck in a part of the colon (faecal impaction on one side)
• Diverticular disease (small pouches in the colon that can trap stool)
• A growth or tumour in the colon that narrows the passage on one side

Risk factors

• Diet low in fibre (not enough fruits, vegetables, and whole grains)
• Not drinking enough water
• Lack of regular physical activity
• Taking medications like opioids, antacids with aluminium, or certain antidepressants
• Having a condition like irritable bowel syndrome (IBS) or diabetes
• Being older, as digestion naturally slows

When to see a doctor

See a doctor urgently if:

• If you have severe belly pain that does not go away
• If you are vomiting or cannot pass gas or stool
• If there is blood in your stool

Book a routine appointment if:

• If your usual pattern of bowel movements changes and lasts more than 3 weeks
• If you have a constant ache or pressure on one side that bothers you
• If you notice weight loss or tiredness along with the constipation

Diagnosis

Your doctor will ask about your symptoms, when they started, and your overall health. They will also feel your abdomen to check for tenderness or a mass. This is usually enough to get an idea of what is going on.

Tests that may be done

• Blood tests to check for anaemia or inflammation
• Stool sample to check for hidden blood
• Abdominal X-ray or CT scan to look at the colon and see if there is a blockage
• Colonoscopy (a camera tube inserted through your bottom) to directly view the inside of your colon

What to expect at your appointment

Your doctor will first take a history and do a physical exam. If the cause is not clear or if there are warning signs, they may order imaging or a colonoscopy. These tests are done to rule out anything serious, such as a narrowing or a tumour. Most people do not need all these tests.

Treatment

Treatment focuses on relieving the constipation and treating any underlying cause. Simple lifestyle changes are often enough. If the problem is due to a specific condition, that will be addressed separately.

Self-care at home

• Drink plenty of water – aim for 6 to 8 glasses a day
• Eat more fibre from fruits, vegetables, beans, and whole grains (add fibre slowly to avoid gas)
• Do regular physical activity, such as walking for 30 minutes most days
• Establish a regular time each day to try to have a bowel movement, especially after meals
• Use a footstool to raise your knees slightly when sitting on the toilet

Medical treatments

If self-care is not enough, your doctor may suggest a gentle over-the-counter laxative, such as a bulk-forming (fibre) product or a stool softener. For persistent cases, prescription medicines that help move stool through the bowel can be considered. If the cause is a spasm, medications to relax the colon muscle may be used. Your doctor will recommend what is safe for you. Always follow your doctor's advice.

When is surgery considered?

Surgery is rarely needed for constipation on one side. It may only be considered if there is a physical blockage (like a tumour or a severe narrowing) that cannot be treated in other ways, or in rare cases of a very slow-moving segment of colon that does not respond to any treatments. Your doctor will discuss this if it becomes an option.

Living with this condition

Living with constipation on one side means keeping a close eye on your bowel habits and diet. Many people find it helpful to keep a diary of what they eat, how much they drink, and when they go to the toilet. This can help you and your doctor adjust your treatment plan.

Lifestyle tips

• Try to have a daily routine that includes physical activity
• Manage stress through relaxation techniques, deep breathing, or hobbies
• Avoid ignoring the urge to go to the toilet – go when you feel the need

Diet and exercise

Eat a fibre-rich diet with plenty of fruits, vegetables, and whole grains. Drink enough water to help the fibre work. Regular exercise (like walking, swimming, or yoga) helps stimulate your bowels and reduce discomfort.

Mental health and emotional wellbeing

Chronic constipation can be frustrating and embarrassing, and it may make you feel anxious about eating or going out. It's normal to feel this way. Talking to your doctor and following a treatment plan can help reduce these feelings. If you feel very stressed or low, ask your doctor about counselling or support.

Prevention

In many cases, yes. Good lifelong bowel habits can help prevent constipation on one side. This means eating plenty of fibre, staying hydrated, being active, and not ignoring the urge to go. If you take medications that can cause constipation, talk to your doctor about ways to offset the effect.

Screening programmes

If you are over 50 or have a family history of bowel cancer, regular screening (like a stool blood test or colonoscopy) can help detect problems early. Ask your doctor when you should start screening.

Complications

If left untreated

• Faecal impaction – a large, hard stool build-up that is difficult to pass
• Hemorrhoids (swollen veins in the rectum) from straining
• Anal fissures (small tears in the anal skin) caused by passing hard stools
• Bowel obstruction (complete blockage) – a rare but serious complication

Long-term outlook

The outlook for most people is very good. With simple changes and the right treatment, constipation on one side usually improves. Even when an underlying cause is found, it can often be managed well. It is important to follow up with your doctor if symptoms do not get better.

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