Every woman has yeast, a common organism, in her vagina at all times. It’s the same bug that causes diaper rash in babies, so yeast is around even if you haven’t been sexually active.
Yeast infections can occur when more yeast than usual grows in the vagina. This can be caused by a variety of factors, such as:
- Taking antibiotics, which kill off the bacteria that keep yeast under control.
- Stress.
- Eating lots of sugary foods.
- Lack of sleep.
- Hormone changes near your period.
When yeast grows too much, it can cause:
- Burning when urinating.
- Itching inside the vagina and on the vulva (lips) outside.
- Heavy, clumpy discharge — sort of like cottage cheese.
- Discharge that’s yellowish to greenish and runny, with a strong odor.
Infections are usually treated with creams that you can buy at a drugstore without a prescription. Follow label instructions.
If your symptoms don’t improve after your first treatment, try a different over-the-counter product. If symptoms still remain after a second course of treatment, see a doctor to get checked out. (Unusual discharge may also be a sign of pelvic inflammatory disease, or PID.)
To prevent yeast infections, wear loose-fitting underwear with a cotton crotch. Cotton helps keep the vulva from getting too hot and moist, conditions that encourage yeast to grow.
Last reviewed: October 2019
