The short explanation
Urinary tract infections that follow sex are common in women because bacteria can be pushed towards the short urethra. Simple steps that help many women include passing urine soon after sex, drinking enough water through the day, wiping from front to back, using lubricant if dry, and avoiding spermicides, which can upset the natural balance. If infections keep happening despite these steps, see a doctor. They may test your urine to confirm infection and check which bacteria are involved, look for other causes, and discuss prevention options, which can include medicine linked to sex or other approaches a clinician may suggest. After menopause, vaginal oestrogen can reduce repeat infections.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Cranberry products are widely used, but evidence for them is mixed.
- Burning after sex can also be due to vaginal infections or STIs, so testing helps.
- Keep a record of infections and when they happen to show the doctor.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell why you get repeated infections. A doctor can test and advise.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Can you confirm these are urine infections with a test?
- What can I do to prevent them?
- Are there preventive treatment options?
- Do I need further tests?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Get help the same day
- Get care the same day if you have fever, back or side pain, vomiting or blood in your urine.
Book an appointment soon
- See a doctor within a day or two for burning urine and frequency.
Raise it at a routine appointment
- Book a routine appointment if you have had two or more infections in six months.
Sources
The evidence this explanation is built on.
- Sexually transmitted infections MedlinePlus (NIH)
- Pelvic inflammatory disease NHS
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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