A vaginal yeast infection is a very common, treatable condition caused by an overgrowth of yeast. The catch is that its symptoms overlap closely with several other conditions, so getting the diagnosis right matters.
What is a vaginal yeast infection?
A vaginal yeast infection (also called vaginal candidiasis or thrush) is an overgrowth of a yeast called Candida. Small amounts of Candida live harmlessly in the vagina alongside protective bacteria. When the balance of the vaginal microbiome shifts, the yeast can multiply and cause irritation. Yeast infections are not generally considered a sexually transmitted infection, though sexual activity can sometimes trigger symptoms.
Yeast infection symptoms
Yeast infection symptoms can range from mild to intense. The most common include:
- Intense itching of the vagina and vulva
- A thick, white discharge often described as looking like "cottage cheese," usually without a strong smell
- Burning, especially during sex or when urinating
- Redness, swelling, and soreness of the vulva
- Small cracks or splits in the skin in more severe cases
Because itching and discharge have many causes, it is easy to confuse a yeast infection with other conditions. If you are dealing mainly with itch, our guide to vaginal itching covers the wider picture, and vaginal discharge explains what different colours and textures can mean.
Yeast infection vs other conditions
One of the most useful things you can do is learn how a yeast infection differs from bacterial vaginosis (BV) and other causes. The treatments are different, so a wrong guess can delay relief. Our dedicated comparison, yeast infection vs BV, goes deeper, but here is a quick overview.
| Feature | Yeast infection | Bacterial vaginosis |
|---|---|---|
| Discharge | Thick, white, "cottage cheese" | Thin, grey or white |
| Smell | Usually little or none | Often a "fishy" odour |
| Itching | Often intense | Usually mild or absent |
| Cause | Overgrowth of Candida yeast | Imbalance of bacterial vaginosis bacteria |
| Treatment | Antifungal (often OTC) | Prescription antibiotics |
Symptoms of yeast infections, BV, urinary tract infections, and some sexually transmitted infections can look alike. A urinary tract infection (UTI), for example, tends to cause burning with urination and a frequent urge to go, rather than the thick discharge of yeast. Because of this overlap, it is best not to self-diagnose if you are unsure — especially the first time.
What causes a yeast infection?
Anything that disrupts the normal balance of yeast and bacteria can trigger an overgrowth. Common triggers include:
- Recent antibiotics, which can reduce the protective Lactobacillus bacteria that normally keep yeast in check; with fewer of these bacteria around, Candida has more room to multiply
- Pregnancy and other hormonal changes, including those linked to the menstrual cycle or hormonal contraception
- Uncontrolled diabetes or higher blood sugar levels, because extra sugar in vaginal secretions can effectively feed the yeast and help it grow
- A weakened immune system or certain medications such as steroids
- Falling estrogen around perimenopause and after menopause, which changes vaginal tissue
Tight, non-breathable clothing and staying in damp swimwear or sweaty gym wear can also create the warm, moist conditions yeast prefers. Often, though, a yeast infection happens with no obvious trigger at all, and that is completely normal.
Yeast infection treatment
Most uncomplicated yeast infections respond well to antifungal treatment. Options include:
- Over-the-counter antifungal creams or pessaries (such as clotrimazole or miconazole), used over one to several days
- A single oral antifungal dose (such as fluconazole) available by prescription, or over the counter in some countries
Creams and pessaries work locally and tend to ease external soreness quickly, while an oral tablet is more convenient but takes a little longer to act and can interact with some other medicines. Both are similarly effective for an uncomplicated infection, so the choice often comes down to preference. Itching usually starts to settle within a couple of days, though mild irritation can linger a little longer as the tissue heals; the antifungal cream can sometimes cause brief stinging when first applied.
If you are pregnant, do not self-treat with oral fluconazole. In pregnancy, only topical antifungals such as clotrimazole or miconazole are recommended, and oral fluconazole is generally avoided — so always speak with a clinician first.
Even though these treatments are widely available, you should see a clinician rather than self-treat if any of the following apply:
- It is your first-ever episode, so the diagnosis can be confirmed
- You get recurring infections (four or more in a year)
- You are pregnant
- Your symptoms are uncertain or do not match a typical yeast infection
- Symptoms do not improve within a few days of treatment, or keep coming back
Recurrent infections sometimes need a longer or repeated course of antifungals guided by a clinician. Remember that BV, which is easy to confuse with yeast, needs prescription antibiotics (such as metronidazole or clindamycin) and will not respond to antifungal creams.
How to prevent yeast infections
You cannot always prevent a yeast infection, but a few habits may help reduce irritation and protect your natural balance:
- Avoid douching — it disrupts the vaginal microbiome and can make problems worse
- Skip scented soaps, sprays, and "feminine hygiene" products on the vulva; warm water is enough
- Wear breathable cotton underwear and change out of wet or sweaty clothing promptly
- Wipe from front to back
It is best to avoid relying on home remedies such as boric acid as a first-line fix; these are not a substitute for proper assessment, and some can cause harm. Talk to a clinician about what is appropriate for you.
Yeast infections and menopause
As estrogen falls during perimenopause and after menopause, vaginal tissue becomes thinner and drier, and the microbiome shifts. This can raise the risk of irritation, dryness, and infection. Our guide to vaginal health after menopause explains these changes, and vaginal dryness in menopause covers a frequently overlapping symptom. For persistent dryness or recurrent infections after menopause, options such as moisturisers and low-dose vaginal estrogen are worth discussing with a clinician. Importantly, any bleeding or new symptoms after menopause always need evaluation.
When to see a clinician
See a clinician if it is your first suspected yeast infection, if infections keep recurring, if you are pregnant, if you are not sure what is causing your symptoms, or if symptoms do not settle with treatment. Seek prompt care if you have a fever, pelvic or abdominal pain, foul-smelling or unusual discharge, sores or blisters, possible exposure to a sexually transmitted infection, or any bleeding. Getting the right diagnosis is the fastest route to the right treatment — and to peace of mind.
