Waking at night to urinate (nocturia): causes and what helps

Nocturia means waking in the night because you need to pass urine. Guy's and St Thomas' NHS Foundation Trust describes it as frequently waking and needing to pee, notes that it often increases with age, and says it is common in older people who may be getting up twice a night. More frequent visits may indicate a treatable problem, and the broken sleep can itself be distressing.

Normally your body makes less urine at night. Bladder and Bowel UK explains that a hormone slows kidney function during sleep so that you produce much less urine overnight. With age, less of this hormone may be produced, so the bladder keeps filling at its daytime rate and you need to go more often.

It is helpful to separate two ideas: making too much urine overnight, and having a bladder that cannot hold or empty properly. Many people have a mixture, and sorting out which applies guides treatment.

The Guy's and St Thomas' leaflet lists several causes, summarised in the table below. Bladder and Bowel UK adds that as people age the bladder loses some elasticity and other medical conditions become more likely.

Bladder and Bowel UK lists the usual tools. A record of your bladder activity tracks what you drink and how often you pass urine. A frequency volume chart, a 24-hour voiding diary, helps tell the different types of nocturia apart. Urinalysis checks for blood cells or bacteria. Blood tests may include urea, electrolytes, kidney function, HbA1c or glucose, calcium and serum osmolality, and an ultrasound scan may be performed if blood tests show abnormalities. Polysomnography is used where obstructive sleep apnoea is suspected.

Keeping a diary for at least 3 days before the appointment makes the consultation far more productive. Note the time and volume of each drink and each trip to the toilet, and mark when you went to bed and got up. You may also be asked about swollen ankles, snoring, thirst and any new medicines.

Guy's and St Thomas' suggests reducing what you drink before bed, for example having your last drink at 8pm rather than 10pm, while still keeping to the recommended daily amount of about 6 to 8 cups of fluid. It says cutting down does not help unless you currently drink large amounts. Fewer caffeine-containing drinks such as tea, coffee, chocolate and cola, and less alcohol, may reduce bladder irritation and sleep disruption.

If your ankles swell, the same leaflet advises sitting or lying with your legs raised at or above heart level for about an hour during the day, and support stockings may help. It also suggests checking whether your room is too light or too cold, reducing daytime naps, and speaking to your GP if pain disturbs your sleep.

• Do not stop any regular medicine without talking to your doctor.

• Ask your GP or pharmacist whether a diuretic could be taken earlier in the day.

• Have fewer caffeine drinks such as tea, coffee, chocolate and cola, especially in the evening.

If nocturia continues you may have a bladder or prostate problem that needs treatment. The trust leaflet explains that prostate problems may be treated with medicines and possibly transurethral resection of the prostate (TURP) surgery. Urge incontinence is commonly treated with antimuscarinic medicines such as solifenacin or tolterodine, which relax the bladder so it can hold more urine.

In a few cases of nocturia caused by low ADH, desmopressin taken about an hour before bedtime reduces overnight urine production, and a low dose of diuretic in the early evening may help pass excess fluid before bed. The doctor or nurse will explain benefits and side effects, and a routine blood test may be taken before prescribing.

Treating the underlying condition, whether sleep apnoea, diabetes or heart failure, is often the most effective step, and your clinician will decide which of these applies.

Bladder and Bowel UK advises making an appointment with your doctor, continence nurse or specialist physiotherapist if the problem is starting to affect everyday life. See your GP promptly if you have burning when passing urine, cloudy or smelly urine, blood in the urine, unexplained thirst or weight loss, or new swelling in the ankles.

Seek urgent medical help if you cannot pass urine at all, or if you have severe pain, fever with urinary symptoms, or chest pain or breathlessness. These are not typical of simple nocturia and need same-day assessment through NHS 111, an urgent GP slot or A&E.

Most people start with their GP or practice nurse, who can arrange urine and blood tests and review medicines. Continence services and, if needed, urology or urogynaecology departments take over for persistent or complicated problems. Sleep services may be involved when sleep apnoea is suspected.

A private urologist can offer faster access to scans, flow tests or prostate assessment, and a private sleep clinic can arrange sleep studies. The tests and treatments are the same as on the NHS, so the useful questions are what tests are proposed, why they are needed and how results will reach your GP.