Can a UTI Go Away on Its Own? Self-Care and When to Get Help

Sometimes. In the one placebo-controlled study of its kind, 28% of women were free of symptoms a week after a bladder infection began without antibiotics, and the NHS says a GP may ask you to wait 48 hours before antibiotics in case symptoms settle. The cost of waiting: in three European trials, about one in 20 women who took a painkiller instead of an antibiotic developed a kidney infection, and in two of the three trials none on antibiotics did.^{1, 2, 3} This is the self-care page of the Wellgard BV guide.

Can a UTI go away on its own, and how often does it?

Some do. The NHS says antibiotics are "not always needed".¹ The one placebo-controlled measurement: among 288 Swedish women given a placebo for a week, 28% were symptom-free at one week and 37% had neither symptoms nor bacteria in their urine at five to seven weeks, 24% once the 39% who dropped out were allowed for. Symptoms matched bacterial counts poorly.² A minority of infections settle within a week, most do not, and "untreated" should mean watched with a plan, never ignored.

How long does a UTI last, with and without antibiotics?

In a UK trial of 309 women, immediate antibiotics meant about three and a half days of moderately bad symptoms; waiting 48 hours cut antibiotic use from 97% to 77%, but symptoms lasted about a third longer.⁴ On a painkiller alone, symptoms had resolved by day three in 54% against 80% on an antibiotic in a Swiss trial of 253 women.⁵ Nothing better at 48 hours is the NHS cue for a GP or 111.¹ A week of burning is a reason to be seen.

What is the NHS 48-hour wait, and what does Pharmacy First do?

Two NHS lines are often run together. The first is about antibiotics: a GP may prescribe a short course, or ask you to "wait for 48 hours before getting antibiotics in case your symptoms go away".¹ The second is self-care: paracetamol for pain and a high temperature, rest and fluids.¹ NICE frames the same choice as a back-up prescription, used "if symptoms do not start to improve within 48 hours or worsen"; pregnant women and men are given antibiotics straight away.⁶ Under Pharmacy First, a pharmacist can assess a woman or girl aged 16 to 64 who is not pregnant or breastfeeding, and the NHS says "a pharmacist can give the same medicines as a GP".^{1, 7} Dipsticks, cultures and "negative tests but symptoms": Pharmacy First and the red flags.

What eases UTI pain while you wait?

The NHS lists paracetamol, rest and enough fluid to pass pale urine; NICE adds ibuprofen "if preferred and suitable".^{1, 6} In 42 German practices, 494 women took three days of ibuprofen or a single-dose antibiotic: two thirds of the ibuprofen group recovered without any antibiotic, but with a higher symptom burden, more kidney infections and four serious adverse events.³ In a Scandinavian trial of 383 women, 38.7% felt cured by day four on ibuprofen against 73.6% on an antibiotic, and all seven kidney infections were in the ibuprofen group; the authors "cannot recommend ibuprofen alone as initial treatment".⁸ Pooled across four trials and 1,165 women, the odds of a kidney complication were 6.49 times higher on a painkiller alone.⁹ A painkiller eases the wait; the 48-hour check is the plan.

What should you drink with a UTI, and can you flush it out?

Water, enough to pass pale urine; the NHS says avoid drinks that may irritate the bladder, "like fruit juices, coffee and alcohol".¹ On sachets and cranberry the NHS says there is "no evidence they help ease symptoms" once an infection has started, and NICE found none for cranberry products or urine-alkalinising sachets either.^{1, 6} The water trial is about recurrence: 140 women who usually drank under 1.5 litres a day added 1.5 litres for a year and had 1.7 infections against 3.2, open-label and funded by a bottled-water producer; it measured how often infections returned, not how fast one settled.¹⁰ No drink, sachet or supplement removes an infection that has started; antibiotics are the treatment. The trials are graded on whether D-mannose or cranberry can flush out a UTI.

Can you have sex with a UTI, and will it affect your period?

No study has tested whether sex during a UTI slows recovery. Sex is a measured trigger for a new infection (the figures are on why you keep getting UTIs), so many women wait until the burning has settled: a reasonable choice, not a rule. A UTI is not a sexually transmitted infection and partners need no treatment; the NHS describes it as "usually caused by bacteria from poo entering the urinary tract".¹ No study links a UTI to a late period, or a period to a new UTI.

Can a UTI make you feel sick, tired, constipated or give you diarrhoea?

"Feeling tired or weak" is on the NHS symptom list, with a high or very low temperature and feeling hot, cold or shivery.¹ Shivering, a high temperature and pain in the back just under the ribs are among what the NHS says "could be symptoms of a kidney infection", which can lead to sepsis: red flags, not a wait. Vomiting is on the NHS list only for children; in an adult it goes with those signs to a GP or 111 the same day.¹ Diarrhoea and constipation are not on the NHS list of UTI symptoms; if either begins during an antibiotic course, ask the pharmacist who supplied it.

Is it a UTI, BV or thrush?

Three conditions, three NHS treatments. A UTI is a bacterial infection of the bladder or urethra: burning on passing urine, urgency and frequency, a urine sample, an antibiotic. Bacterial vaginosis is a shift in the vaginal bacteria: a thin grey discharge and a fishy smell, a vaginal swab, an antibiotic. Thrush is a yeast: itch, soreness and a thick white discharge that does not usually smell, a swab, an antifungal; it stings as urine passes over sore skin, which is why it is mistaken for cystitis. The ingredient evidence does not transfer. Cranberry's is in recurrent UTI only, about a quarter fewer infections in the 2023 Cochrane review of 50 trials (relative risk 0.74), with no trial in BV or thrush.¹¹ D-mannose, which the NHS says has "some evidence it may be helpful", did not differ from placebo in the UK trial of 598 women, 51.0% against 55.7%.^{1, 12} Live cultures taken after antibiotics went with BV recurrence of 14.8% against 25.5% in ten trials of 1,234 women, while in the 2015 Cochrane review they did not significantly reduce recurrent UTIs (relative risk 0.82) and a benefit could not be ruled out.^{13, 14} The decision page sorts BV, thrush or a UTI.

When does a UTI need a GP, 111 or 999?

The NHS says to ask for an urgent GP appointment or get help from 111 if you think you have a UTI and you are aged 65 or older; your child is 15 or younger; you have a very high or low temperature, feel hot or cold, or are shivering; you are a man; you have diabetes; your symptoms get worse quickly or do not improve within 48 hours of starting treatment or treating it yourself; you keep getting UTIs (two in six months or three in a year); you use a catheter; you are pregnant; you have pain in the lower tummy or in the back just under the ribs; you have blood in your urine; or you have a weakened immune system. Call 999 or go to A&E if you are confused, drowsy or have difficulty speaking.¹ In pregnancy there is no wait: NICE says antibiotics are given straight away, and your midwife or GP is the first call; see UTIs in pregnancy.⁶ After 65, sudden confusion is a same-day sign; more on UTIs after the menopause.

Frequently asked questions

Can you flush out a UTI with water or cranberry juice?

No. The NHS says there is "no evidence they help ease symptoms" once an infection has started.¹ Fluids keep urine pale; the water trial measured fewer infections over a year, not a faster recovery from one.¹⁰

How quickly should antibiotics work, and when should I go back?

Expect easing rather than a switch: immediate antibiotics still meant about three and a half days of moderately bad symptoms in the UK trial.⁴ Finish the course, and go back if symptoms get worse or have not improved within 48 hours of starting.¹

Why do I keep getting UTIs?

Two in six months or three in a year is recurrent UTI in NHS terms; the triggers and the NICE options are on why you keep getting UTIs.¹

Can BV go away on its own?

Sometimes, but it is a different condition with a different test and treatment; see can BV go away on its own.

Sources

1. NHS. Urinary tract infections (UTIs), reviewed 11 July 2025. nhs.uk/conditions/urinary-tract-infections-utis.
2. Ferry SA, et al. The natural course of uncomplicated lower urinary tract infection in women illustrated by a randomized placebo controlled study. Scandinavian Journal of Infectious Diseases, 2004. PubMed 15198188.
3. Gágyor I, et al. Ibuprofen versus fosfomycin for uncomplicated urinary tract infection in women: randomised controlled trial. BMJ, 2015. PubMed 26698878.
4. Little P, et al. Effectiveness of five different approaches in management of urinary tract infection: randomised controlled trial. BMJ, 2010. PubMed 20139214.
5. Kronenberg A, et al. Symptomatic treatment of uncomplicated lower urinary tract infections in the ambulatory setting: randomised, double blind trial. BMJ, 2017. PubMed 29113968.
6. NICE. Urinary tract infection (lower): antimicrobial prescribing, NG109, published 31 October 2018. nice.org.uk/guidance/ng109.
7. NHS. How pharmacies can help, reviewed 30 July 2024. nhs.uk/nhs-services/pharmacies/how-pharmacies-can-help.
8. Vik I, et al. Ibuprofen versus pivmecillinam for uncomplicated urinary tract infection in women: a double-blind, randomized non-inferiority trial. PLoS Medicine, 2018. PubMed 29763434.
9. Ong Lopez AMC, et al. Symptomatic treatment (using NSAIDs) versus antibiotics in uncomplicated lower urinary tract infection: a meta-analysis and systematic review. BMC Infectious Diseases, 2021. PubMed 34187385.
10. Hooton TM, et al. Effect of increased daily water intake in premenopausal women with recurrent urinary tract infections: a randomized clinical trial. JAMA Internal Medicine, 2018. PubMed 30285042.
11. Williams G, et al. Cranberries for the prevention of urinary tract infections (Cochrane review). Cochrane Database of Systematic Reviews, 2023. PubMed 37068952.
12. Hayward G, et al. D-mannose for prevention of recurrent urinary tract infection among women: a randomized clinical trial. JAMA Internal Medicine, 2024. PubMed 38587819.
13. Chieng WK, et al. Probiotics, a promising therapy to reduce the recurrence of bacterial vaginosis in women? A systematic review and meta-analysis. Frontiers in Nutrition, 2022. PubMed 36204368.
14. Schwenger EM, et al. Probiotics for the prevention of urinary tract infections in adults and children (Cochrane review). Cochrane Database of Systematic Reviews, 2015. PubMed 26695595.

This article is general information, not medical advice; the red flags above mean a GP, 111 or 999 the same day.