What causes yeast infections and how can I prevent them?

Can my boyfriend get a yeast infection, too? — M.W., Indiana

Yeast infections are caused by an overabundance of the fungus candida. Candida is frequently present in healthy individuals, not only on their skin but also in moist areas like the mouth and vagina. It normally only causes infections when the body is out of balance and an over-abundance of the yeast occurs.

This can be caused by lots of things. Antibiotics are a common cause, and introduction of a new lubricant or frequent douching can cause yeast infections, as can improperly cleaned sex toys, dirty fingers or using food items during sex.

Bad diet, not washing new panties before you wear them and too-tight clothes can lead to infections, too. The list of possible causes... Read More