Why does MS cause bladder problems?

MS can damage the nerve pathways controlling the bladder, disrupting filling and emptying. This causes storage problems (urgency, frequency, waking at night, urge incontinence) and emptying problems (hesitancy, weak stream, incomplete emptying), which often overlap. They are very manageable with fluid advice, bladder training, pelvic-floor work, and specialist input.

Should I drink less to reduce MS bladder accidents?

No. Do not drastically cut fluids, because concentrated urine irritates the bladder and raises the risk of infection. Drink a steady, reasonable amount through the day, reduce irritants such as caffeine and alcohol, keep a bladder diary, and try pelvic-floor exercises and bladder training. A continence nurse can guide further options.

Can a urinary infection make MS symptoms worse?

Yes. A urinary tract infection can temporarily worsen existing MS symptoms such as spasticity, weakness, fatigue and thinking difficulties – a pseudo-relapse – and untreated may mimic or trigger a relapse. Incomplete bladder emptying is the commonest cause of UTIs in MS, so a sudden worsening of symptoms should prompt a check for infection.

Bladder and Bowel Problems in Multiple Sclerosis (Singapore)

Written & reviewed by the BestDoctors.sg editorial team · Last updated 29 Aug 2026 · General information, not medical advice

Quick answer. MS commonly affects the bladder and bowel because it disrupts the nerve pathways that control them. Bladder problems split into storage issues (urgency, frequency, waking at night, and urge incontinence) and emptying problems (a weak or hesitant stream and incomplete emptying). Constipation is the most common bowel problem. These are very manageable with fluid advice, bladder and bowel routines, pelvic-floor work, specialist input and, where needed, techniques such as intermittent self-catheterisation. A key point: a urinary tract infection can temporarily worsen MS symptoms, so a sudden worsening should prompt a check for infection. A bladder that will not empty needs prompt care.

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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.

Why MS affects the bladder

MS can damage the nerve pathways between the brain, spinal cord and bladder, disrupting the normal cycle of filling and emptying. This produces two broad types of problem, which often overlap. Storage or overactive bladder problems – urgency, needing to go frequently, waking at night to pass urine, and urge incontinence – happen when the bladder signals that it is full and contracts before it should. Emptying problems – hesitancy, an interrupted or weak stream, and incomplete emptying or retention – happen when the bladder does not fully empty, sometimes without the person feeling it, because the bladder muscle and the sphincter are not coordinating well.

Managing the bladder

Bladder problems are managed in a graded way, starting with simple measures. Sensible fluid advice matters: drink a steady, reasonable amount through the day, and do not drastically cut fluids to reduce accidents, because concentrated urine irritates the bladder and raises the risk of infection. Reducing bladder irritants such as caffeine and alcohol, keeping a bladder diary, and doing pelvic-floor exercises and bladder training all help. A specialist may consider medicines that calm an overactive bladder, and for incomplete emptying, intermittent self-catheterisation – a clean technique taught by a continence nurse to drain the bladder periodically – is a common and effective approach. Specialist continence and urology input guides any escalation.

Bowel problems in MS

Bowel problems are also common in MS, and constipation is the most frequent, arising from slowed nerve signals to the gut, reduced mobility, low fluid or fibre intake, fatigue, and the side-effects of some medicines, including certain bladder drugs. Less often, people experience bowel urgency or incontinence, and some have both constipation and incontinence. As with the bladder, these problems can feel embarrassing, but they are usually very manageable with the right approach, and they should be raised with your team rather than suffered in silence. Getting on top of bowel problems also improves comfort and confidence, and can even ease spasticity, which a full bowel can worsen.

Managing the bowel

Bowel management centres on a few practical habits. Regular meals with adequate fibre, drinking enough fluid, staying physically active, keeping a consistent toileting routine with correct toilet positioning, and gentle abdominal massage all help. Where these are not enough, a clinician may consider laxatives or suppositories, transanal irrigation, pelvic-floor exercises or biofeedback – described here in general terms, as options guided by a specialist. Early referral to a GP, MS specialist nurse or continence service is advised, because most bowel problems can be managed well with the right support. Building a steady routine, and giving changes time to work, tends to be more effective than sudden big adjustments.

The link with urinary infections

An important teaching point is the link between urinary tract infections and MS symptoms. A UTI can make existing MS symptoms – such as spasticity, weakness, fatigue and thinking difficulties – temporarily worse, a pattern called a pseudo-relapse, and if left untreated it may even mimic or trigger a relapse. Incomplete bladder emptying is the most common reason people with MS get UTIs, because urine that sits in the bladder allows bacteria to grow. This is why a sudden worsening of MS symptoms should always prompt a check for infection, and why good bladder management, which reduces UTIs, is so valuable.

When to seek prompt help

Some situations need prompt attention. Because a UTI can worsen MS symptoms, any sudden worsening warrants checking for a urinary or other infection; a UTI needs treating, and symptoms usually settle once it is treated. If you have been treated with antibiotics but symptoms do not improve within a couple of days, seek review, and signs of a more serious infection – a high fever, confusion, or feeling very unwell – are an emergency, so call 995. A bladder that will not empty, or a painful, swollen bladder, needs prompt medical attention, as does blood in the urine or a high fever with back pain.

Getting support in Singapore

Bladder and bowel problems in MS are very treatable, and you do not have to manage them alone. In Singapore, the National Neuroscience Institute provides specialist MS care, and continence nurses and urology or uro-gynaecology services in the public hospitals can review a bladder diary, teach intermittent self-catheterisation, and guide treatment. The Multiple Sclerosis Society Singapore offers peer support and education. Raising these problems early, rather than putting up with them, usually leads to real improvement in comfort, confidence and quality of life – and helps prevent complications such as recurrent urinary infections.

Sources

MS Trust – Bladder problems: mstrust.org.uk
MS Trust – Bowel problems: mstrust.org.uk
MS Trust – Urinary tract infection (UTI): mstrust.org.uk
National MS Society – Bladder problems: nationalmssociety.org

General information only. This guide supports, but does not replace, advice from your own neurologist and MS care team. Never stop or change a disease-modifying therapy without medical advice. Report new or worsening symptoms that last more than a day to your MS team – but remember that an infection such as a urinary tract infection, or getting too hot, can also worsen MS symptoms temporarily, so these causes should be checked and treated. Call 995 for sudden severe symptoms, such as sudden weakness or drooping of the face, which should be treated as a possible emergency. Be wary of unproven, expensive “cures.” If you are struggling emotionally, you are not alone: the Samaritans of Singapore (SOS) are on 1767 and mindline.sg on 1771.

Bladder & Bowel Problems in Multiple Sclerosis