Förstoppning
Granskad av Dr Toni Hazell, MRCGPSenast uppdaterad av Dr Caroline Wiggins, MRCGP Senast uppdaterad 31 mars 2026
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Constipation means you are pooing less than normal, are struggling to poo, or are having painful poos. It is usually caused by not eating enough fibre, or not drinking enough fluids.
Key points
Constipation is a common digestive problem that can affect people of any age. It involves infrequent bowel movements (pooing), hard or painful poos, straining, or a feeling of incomplete emptying.
It is commonly caused by dietary and lifestyle factors such as not eating enough fibre, not drinking enough fluid, a lack of physical activity, and changes in routine.
Most constipation can be relieved by increasing fibre and fluids, staying active, responding to the urge to open your bowels, and taking over-the-counter laxatives.
What is constipation?
Constipation means having difficulty pooing (passing stools), having fewer poos than usual, or having poos that are hard, dry, or painful to pass.
Some people with constipation can feel the need to strain to pass the poo, or feel that their bowels have not emptied completely.
This information leaflet discusses constipation in adults. For constipation in children, see our information leaflet called Förstoppning hos barn.
What is constipation?
Constipation symptoms
You may be constipated if:
Your poo is hard and difficult or painful to pass.
You're pooing less frequently than usual.
You have stomach ache or cramps.
You feel bloated or sick.
It does not feel as though you have emptied your bowel or 'finished' after pooing.
How long does constipation last?
Constipation can last for just a day, or several days, depending on the cause and if steps are taken to improve it.
Chronic constipation lasts for at least 12 weeks out of the past 6 months.
What causes constipation?

Common causes of constipation include:
Not eating enough fiber - this is found in foods such as fruits, vegetables, and cereals.
Not drinking enough fluids - which can lead to dehydration.
Lack of physical activity.
Certain medicines – such as painkillers (especially ones with codeine), antacids, antidepressants such as amitriptyline, iron tablets, and some blood pressure medicines.
Medical conditions - such as an underaktiv sköldkörtel, irritable bowel syndrome, diverticular disease och colon cancer.
Pregnancy - caused by hormonal changes and pressure from the growing womb. About 1 in 5 pregnant women will become constipated.
Constipation can also be caused by:
Ignoring the urge to poo when you need to go to the toilet.
Changes to your routine.
Changes to your diet.
Stress, ångest, och depression.
Difficulty accessing a toilet.
Functional constipation
Some people develop constipation despite a healthy diet, good fluid intake, and no underlying illness or medicines. It causes chronic (long term) constipation and has no identifiable cause. This is known as functional (primary) constipation.
It is common, affects women more often than men and it usually begins in childhood or early adulthood.
How to treat constipation
Lifestyle and diet changes
Gradually increase the fibre in your diet to 30g daily. Wholegrains, fruit and vegetables are higher in fibre than other foods. For information on increasing fibre in your diet see the information sheet on fibre by the British Dietetic Association (BDA) in Further Reading below.
Ensure you drink enough water each day to stay hydrated. The BDA information sheet on Fluid in Further Reading below shows why water is important and how much you need to drink.
Being physically active encourages your bowel to move food along through your gut, avoiding constipation.
Go to the toilet to poo as soon as you feel the need to.
Over-the-counter medicine
Some medicines to help short term constipation can be bought over the counter at a pharmacy or supermarket. These medicines can be used for up to one week. If your constipation lasts longer than a week you should see a doctor. If you are pregnant or breastfeeding you should discuss your constipation with a pharmacist so they can advise you which laxatives are safe to use.
När man ska träffa en läkare
You should see a doctor:
If your constipation lasts longer than one week.
If you have severe tummy pain.
You are regularly experiencing constipation and cannot identify an obvious cause.
You are sick (vomiting) and constipated.
You are losing weight.
You notice bleeding from your bottom (anus).
The feeling of not emptying your bowels completely after you have a poo continues once the constipation has got better.
How to prevent constipation
You can help prevent constipation by following the diet and lifestyle advice in the section "How to treat constipation" above.
Vanliga frågor
Can paracetamol cause constipation?
No, paracetamol does not cause constipation.
Are bananas good for constipation?
Ripe bananas can help improve constipation as they are high in fibre, but unripe bananas may contribute to constipation.
What foods should you avoid when constipated?
There are no particular foods to avoid, but try to focus on increasing wholegrain foods which are high in fibre and making sure you are drinking enough water.
How long should I sit on the toilet if I'm constipated?
There are no set rules. Instead, make sure you are relaxed when sitting on the toilet, sitting upright with your feet flat on a steady surface and stay on the toilet until you feel you have emptied your bowels.
Patientval för Bowel problems

Hälsoundersökning
Delta i en studie som undersöker en ny multistrain bakterieprodukt för förstoppning
Constipation can cause significant discomfort and disruption to daily life. A new research study run by The Functional Gut Clinic is investigating whether a multi-strain bacterial food product can help improve bowel regularity and gut function. The study has been approved by an independent ethics committee and adheres to Good Clinical Practice. Many people with constipation try different treatments before finding something that helps. This study aims to explore whether a targeted bacterial product could offer benefits for gut transit and digestive comfort.
av Thomas Andrew Porteus, MBCS

Barnhälsa
Förstoppning hos barn
Förstoppning är ett mycket vanligt problem hos barn. För de flesta barn innebär förstoppning att de har svårt att tömma tarmen och att avföringen är hård och kommer mer sällan än normalt. Regelbundet nedsmutsning (ofta misstaget för lös diarré) kan indikera att ett barn har svår förstoppning som orsakar en blockering i den nedre delen av tarmen (impaktion). När ingen särskild sjukdom eller åkomma är orsaken till förstoppningen, kallas det idiopatisk förstoppning. Det är viktigt att förstoppning upptäcks tidigt för att förhindra att det blir ett långvarigt (kroniskt) problem. Obs: för vuxna, se det separata informationsbladet kallat Förstoppning.
av Dr Hayley Willacy, FRCGP
Vidare läsning och referenser
- Förstoppning; NICE CKS, November 2025 (UK access only)
- Fiber; Föreningen för brittiska dietister (BDA)
- Fluid. British Dietetic Association.
- Gastrointestinal tract (lower) cancers - recognition and referral; NICE CKS, August 2023 (UK access only)
Om författarenVisa fullständig biografi

Dr Caroline Wiggins, MRCGP
Allmänläkare, Medicinsk Författare
MBBS Honours (med utmärkelse), MRCGP (2016), MSc.SEM (med utmärkelse), BSc (Hons)
Dr Caroline Wiggins is a GP locum currently in the South-West of England.
Om recensentenVisa fullständig biografi

Dr Toni Hazell, MRCGP
MBBS, BSc, MRCGP, DFSRH, Dip GU med, DRCOG, DCH (London, UK, 2000)
Dr. Toni Hazell tog examen från St. Mary’s Hospital Medical School och genomförde sin VTS vid Northwick Park Hospital.
Artikelhistorik
Informationen på denna sida är skriven och granskad av kvalificerade kliniker.
Artikeln finns också på Engelska, Tyska, Spanska, Franska, Italienska, Portugisiska, Hindi, Hebreiska, Arabiska, och Svenska.
Next review due: 31 Dec 2030
31 mars 2026 | Senaste versionen

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