Why Do Intimate Infections Keep Coming Back? Yeast Infections, BV and UTIs Explained
You finish a course of treatment, the symptoms clear — and a few weeks later they're back. You buy the same medicine again, it settles for a while, and then it returns.
If that sounds familiar, the first thing to know is this: recurring infections don't mean you aren't clean enough, and they don't mean you've done something wrong. They usually mean that something was missed the last time round.
Drawing on guidelines from the US Centers for Disease Control and Prevention (CDC) and the American Urological Association (AUA), plus recent clinical research, this guide explains the three intimate infections most likely to keep coming back, how doctors define "recurrent", and what to prepare before you see a doctor.
The 30-second version
- Three infections recur most often: vaginal yeast infection (thrush), bacterial vaginosis (BV) and urinary tract infection (cystitis). Each has different causes and needs different management.
- There are clear medical definitions: three or more yeast infections in a year, or two UTIs in six months (or three in a year), count as "recurrent" and warrant further testing.
- Self-diagnosis is often wrong: itching, discharge and odour aren't unique to any one infection, and using the wrong treatment is a common reason infections come back.
- Your partner may be the missing piece: a 2025 study found that treating male partners as well cut BV recurrence from about 63% to about 35%.
- If it keeps coming back, see a doctor and ask for testing — rather than buying the same treatment again.
First, which infection is it?
It's common to call any intimate discomfort an "infection", but recurring problems are usually one of three conditions. They affect different areas, have different causes and need different management — so the first step is working out which one you're dealing with.
| Yeast infection | Bacterial vaginosis (BV) | UTI (cystitis) | |
|---|---|---|---|
| Typical signs | Marked itching and burning; discharge may be white and thick | Thin, greyish-white discharge; fishy odour, often stronger after sex | Stinging when passing urine, frequency, urgency, lower-abdominal discomfort |
| What counts as "recurrent" | Three or more symptomatic episodes in a year | No single agreed number; recurrence within a year of treatment is very common | Two culture-confirmed infections in six months, or three in a year |
| Common reasons it comes back | Non-albicans strains, poorly controlled blood sugar, frequent antibiotics; many cases have no clear trigger | Re-transmission between partners, douching, not using condoms | Sex, lower oestrogen after menopause, not drinking enough water |
| Test to ask for when it recurs | Vaginal swab culture or PCR to identify the strain | Clinical assessment and lab testing by a doctor | Urine culture to identify the bacteria and the right antibiotic |
If you're not sure which applies to you, start with our guide to telling itching, discharge, odour and painful urination apart. But bear in mind that symptoms alone are an unreliable guide — which is exactly the problem covered next.
Why does the same infection keep coming back?
1. The last diagnosis may not have been right
CDC guidelines state clearly that itching, burning and increased discharge are not specific to yeast infection: bacterial vaginosis, trichomoniasis and contact dermatitis can all look similar.
One US study found that among women who diagnosed themselves with a yeast infection and bought an over-the-counter treatment, only about a third were confirmed by testing to have a yeast infection alone. In other words, a substantial share were using a treatment that didn't match the problem — symptoms might ease for a while, but the real cause went untreated.
A common cycle: assume it's thrush → buy an antifungal → feel a little better → it's back a few weeks later → buy the same treatment again. If you've been round this loop two or three times, the issue is probably not that the treatment "isn't strong enough" but that it's aimed at the wrong thing.
2. A different strain may not respond to standard treatment
Most yeast infections are caused by Candida albicans, which usually responds well to standard azole antifungals. But according to the CDC, around 10–20% of women with recurrent yeast infections have non-albicans species such as C. glabrata, which respond less well to standard treatment.
Resistance to azoles among C. albicans is also becoming more common. That's why the CDC recommends that recurrent or complicated yeast infections be confirmed by culture or PCR to identify the species, rather than treated by guesswork.
3. Re-transmission between partners
Bacterial vaginosis has traditionally not been treated as a sexually transmitted infection, and guidelines have not recommended treating partners. A randomised trial published in the New England Journal of Medicine in 2025 changed that picture.
The trial enrolled 164 monogamous heterosexual couples in which the woman had BV. In one group only the woman was treated; in the other, the male partner was also given oral and topical treatment. After 12 weeks, about 63% of women in the woman-only group had a recurrence, compared with about 35% where both partners were treated. The difference was large enough that the trial was stopped early.
This shows that, in an ongoing relationship, re-transmission between partners is an important driver of recurrent BV. Some health authorities have started advising clinicians to consider treating partners at the same time. If your BV keeps coming back, it's worth raising this option with your doctor.
Yeast infections are different: they generally aren't considered sexually transmitted, and current guidelines don't recommend routinely treating partners. If you notice infections tend to follow sex, see our guide to sex during a vaginal infection and talk it through with your doctor.
4. Antibiotics, blood sugar and hormones
The CDC notes that recurrent yeast infections can be "secondary" — linked to frequent antibiotic use, diabetes or other health conditions — but also stresses that most women with recurrent yeast infections have no apparent underlying cause. So not finding a reason doesn't mean you've done anything wrong.
- Antibiotics: while clearing the bacteria causing an infection, they also affect the lactobacilli in the vagina. See why antibiotics can lead to a yeast infection.
- Blood sugar: poorly controlled blood sugar is linked with recurrent yeast infections. If infections are frequent and you also feel unusually thirsty or need to urinate more, ask your doctor to check your blood sugar.
- After menopause: lower oestrogen thins the vaginal and urethral tissues and changes the vaginal environment, a common reason for recurrent UTIs after menopause. The AUA recommends that peri- and postmenopausal women with recurrent UTIs consider vaginal oestrogen to reduce the risk of recurrence, if there's no reason they can't use it. See our guide to vaginal dryness in perimenopause and menopause.
5. Cleaning too much can upset the balance
When discomfort keeps returning, it's natural to want to wash more often and more thoroughly. But the vagina cleans itself, and douching, scented products and over-washing can all disrupt the balance of vaginal lactobacilli — douching is a known risk factor for bacterial vaginosis.
The vulva only needs gentle washing; the inside of the vagina doesn't need — and shouldn't be given — any cleaning. For how to wash correctly, see our intimate care guide for women in Hong Kong.
When should you see a doctor?
What to prepare before your appointment
The hardest part of recurrent infections is that symptoms have often eased by the time you see a doctor, so they only see part of the picture. Preparing the following can help you get more out of one appointment.
Worth writing down
- The date of each episode, and how it relates to your cycle, sex and any antibiotics
- The main symptoms each time: itching, odour, colour and texture of discharge, any stinging when you urinate
- Treatments you've used: names, how many days, and whether you finished the course
- Any previous test results: bring them along
- Your situation: whether you're pregnant or planning to be, whether you have diabetes, and any medicines you take
At the appointment, you can ask directly: "Given how often this is happening, should I have a culture test to confirm what it is?" That's a reasonable request — not a nuisance.
How doctors usually manage recurrent infections
This is only an overview — the actual plan must be decided by your doctor based on your situation. Don't adjust any medication yourself.
- Recurrent yeast infection: confirm the species by testing, control the episode with a longer initial course, then possibly a maintenance course lasting up to six months. The CDC notes that maintenance treatment controls episodes well, but recurrence is still possible after stopping.
- Recurrent BV: your doctor may suggest longer-term suppressive treatment and, depending on your situation, discuss whether your partner should be treated at the same time.
- Recurrent UTI: a urine culture with each episode, then a discussion of options such as drinking more water, vaginal oestrogen after menopause, or preventive antibiotics. The AUA also notes that cystoscopy or imaging is not routinely needed.
Everyday habits worth adjusting
These habits don't replace a medical assessment, but they can reduce irritation and common triggers.
- Drink more water: in a randomised trial, women who drank about 1.5 litres of extra water a day had noticeably fewer UTIs over a year.
- Pass urine after sex, and wash the vulva gently with water.
- Use condoms, especially during and after treatment for BV.
- Don't douche, and avoid scented washes, intimate perfumes and scented liners.
- Keep the area dry: choose underwear with a cotton gusset and change promptly after exercise. See our guide to choosing and washing underwear.
- Finish the full course: even once symptoms clear, complete the treatment as your doctor advised.
Three common myths
Myth 1 | Recurring infections mean you're not clean enough
No. Over-cleaning is actually one of the triggers. More common reasons include an inaccurate diagnosis, a different strain, re-transmission between partners, or changes in hormones and general health.
Myth 2 | That treatment worked before, so I can just buy it again
After a first confirmed diagnosis, some people can manage occasional episodes themselves with their doctor's agreement. But once infections keep recurring, self-treating again can delay finding the real cause — and may make resistance worse.
Myth 3 | Supplements can cure recurring infections
They can't. Current CDC guidelines don't list any supplement as standard treatment for yeast infection or bacterial vaginosis. If you're considering any supplement, discuss it with a doctor or pharmacist first — and don't use it in place of medical care.
FAQ
I've had two yeast infections this year — does that count as recurrent?
By the CDC definition, recurrent yeast infection means three or more symptomatic episodes within a year. That said, the CDC also advises that if symptoms return within two months of finishing treatment, you should be reassessed and tested by a doctor.
Do I need to see a gynaecologist?
A family doctor can usually assess you and arrange testing first. If tests show a non-albicans species, infections keep recurring despite maintenance treatment, or the picture is more complex, your doctor will usually refer you to a gynaecologist or other specialist.
My partner has no symptoms — do they need testing or treatment?
It depends on the infection. For BV, new research supports considering treating a male partner in an ongoing relationship; for yeast infections, routine partner treatment generally isn't recommended. If it's a sexually transmitted infection such as trichomoniasis, partners must be treated too. Follow your doctor's advice.
Can I buy treatment myself if I keep getting infections while pregnant?
It's not advisable. Some oral medicines aren't suitable in pregnancy, so any infection symptoms should be assessed by a doctor first before deciding how to manage them.
Recurring isn't your fault — it just means there's a cause that hasn't been found yet.
Keep a record of each episode, so your doctor can see the whole picture.
Related reading
Sources
- Centers for Disease Control and Prevention. Vulvovaginal Candidiasis (VVC). Sexually Transmitted Infections Treatment Guidelines, 2021.
- Centers for Disease Control and Prevention. Bacterial Vaginosis. Sexually Transmitted Infections Treatment Guidelines, 2021.
- Vodstrcil LA, Plummer EL, Fairley CK, et al. Male-Partner Treatment to Prevent Recurrence of Bacterial Vaginosis. New England Journal of Medicine. 2025;392(10):947–957.
- Bradshaw CS, Morton AN, Hocking J, et al. High recurrence rates of bacterial vaginosis over the course of 12 months after oral metronidazole therapy and factors associated with recurrence. Journal of Infectious Diseases. 2006;193(11):1478–1486.
- Ferris DG, Nyirjesy P, Sobel JD, et al. Over-the-counter antifungal drug misuse associated with patient-diagnosed vulvovaginal candidiasis. Obstetrics & Gynecology. 2002;99(3):419–425.
- American Urological Association / Canadian Urological Association / SUFU. Recurrent Uncomplicated Urinary Tract Infections in Women: AUA/CUA/SUFU Guideline (2025 amendment).
- Hooton TM, Vecchio M, Iroz A, et al. Effect of Increased Daily Water Intake in Premenopausal Women With Recurrent Urinary Tract Infections: A Randomized Clinical Trial. JAMA Internal Medicine. 2018;178(11):1509–1515.
This article is for general health education only. It is not medical advice, diagnosis or treatment, and does not replace the advice of a registered doctor. If you have any symptoms or concerns, please consult a gynaecologist or another qualified healthcare professional.