Why does thrush keep coming back?
Why vaginal thrush recurs in some women, what the risk factors are, the part misdiagnosis plays, and what helps to prevent it coming back.
Most women have vaginal thrush at least once in their lives. In a small group, though, the infection never quite clears and keeps returning. What follows explains why that happens, what triggers it, and what helps to prevent it.
What counts as recurrent?
Having four or more symptomatic episodes of thrush in a year is called recurrent thrush. It affects roughly 5-15% of women of reproductive age.
Why does it keep coming back?
Contrary to a common assumption, most recurrent thrush is not caused by a new organism arriving from outside each time. The fungus itself, Candida albicans, is already present harmlessly in the vaginal flora of a substantial proportion of healthy women. The real reason for recurrence lies in subtle imbalances in the local immune response that normally keeps that fungus in check. In some cases, different fungal species that are more resistant to standard treatments also play a part.
What triggers a recurrence?
- Antibiotics: antibiotics taken for any reason also kill the protective bacteria that keep the fungus down, clearing the ground for it to multiply.
- Poorly controlled diabetes: high blood sugar creates favourable conditions for the fungus to grow.
- Hormonal changes: pregnancy, high-dose contraceptive pills or hormone treatments can make vaginal tissue more hospitable to the fungus.
- Anything that suppresses immunity: certain conditions and medicines that weaken the immune system make fungal overgrowth easier.
- A damp environment with no air: tight synthetic underwear, staying damp for long periods or constant use of panty liners can all create favourable conditions.
The part misdiagnosis and incomplete treatment play
A substantial share of recurring complaints comes down to the diagnosis never having been right in the first place. Deciding for yourself that it is thrush and buying something from a pharmacy can mean treating the wrong thing — a complaint that actually comes from something else, such as a disturbance of the natural bacterial balance — and making the situation more complicated. In recurrent cases a doctor may request a culture test to establish exactly which organism is responsible. Stopping treatment as soon as the symptoms seem to ease can also lead to a flare-up shortly afterwards.
What helps to prevent it?
- Avoid washing inside the vagina with water or soap (vaginal douching) altogether; it disturbs the protective balance of bacteria.
- Choose loose, pure cotton underwear rather than synthetic, and sleep without underwear where possible.
- Clean from front to back after using the toilet.
- In recurrent cases a doctor may suggest a longer preventive treatment plan after the acute episode; this is entirely an individual decision and must be carried out under medical supervision.
Frequently asked questions
Is every itch thrush?
No. Itching can have other causes, and self-diagnosis can be misleading, so with recurring complaints it is important to be examined by a doctor.
Does my partner need treatment too?
Vaginal thrush is not a sexually transmitted infection. If the partner has no symptoms — redness or itching — routine treatment is not needed.
This page is for information. It does not replace an examination or individual medical advice.