Under normal circumstances, women have yeast present around the vagina, anus, and mouth. Usually, it does not cause disease, but yeast infection in the vagina may occur under certain triggers. Many women also experience recurrent episodes. For example, if a woman has diabetes, an increase in local blood sugar levels can trigger a yeast infection of the vagina. Additionally, women with decreased resistance or immune deficiencies, the use of immunosuppressants, or the large-scale use of antibiotics can also trigger an infection. Furthermore, some women, especially in the summer, prefer to wear tight synthetic underwear, which can prevent timely discharge of vaginal secretions, accumulate around the external genitalia, and potentially lead to infection.