What can cause a yeast infection?

Several factors: Several factors can cause a yeast infections- 1. Local balance of normal flora is disrupted, typically from the recent use of antibiotics; 2. Impaired immunity- this may be due to steroid use or having other illnesses such as diabetes or hiv; 3. Misdiagnosis of symptoms in the absence of yeast from testing- adverse drug effects can be mistaken as a yeast infection.

Yeast : Yeast infections are due to a fungus called Candida which is normally found in the vagina. However, if there is a lack of healthy vaginal bacteria it can lead to overgrowth of yeast. Some causes of overgrowth: antibiotics, ^ estrogen (pregnancy or some birth control pills), malfunctioning immune system, diabetes mellitus as well as friction against vaginal tissues (intercourse) & douching.

Fungus: A yeast infection is caused by fungus (often candida albicans) that multiplies in your mouth, your vagina, or your skin.