The causes of mycosis vaginalis are as follows: 1. Patients with high blood glucose have increased blood glucose in their bodies, and their immune system has decreased, so the glycogen content of the vagina increases and the acidity increases, which is conducive to the growth and reproduction of mycobacteria in the vagina. 2. 3. women often take birth control pills, which can also lead to mycotic vaginitis. 4. wearing tight-fitting chemical fiber underwear and obesity can lead to increased local humidity and temperature in the vulva and vagina, which is very conducive to the reproduction of mycobacteria.