A yeast infection is a common type of vaginal infection. Its main symptom is a thick, cottage cheese-like discharge from the vagina as in your case. Some women get yeast infections frequently, but for no apparent reason. However, women who are taking antibiotics; have frequent, vigorous sex; or take birth control pills may have a greater risk of getting a yeast infection. Yeast infections also tend to worsen the week before the menstrual period. Women with immune system deficiencies, such as AIDS; women who are pregnant; and women with uncontrolled diabetes may also get repeated yeast infections. One can help prevent yeast infections by keeping your genital and rectal area clean and dry; wearing clean, cotton underwear each day; wiping from front to back after you go to the bathroom; douching no more than once per month; and avoiding vaginal deodorants. Although its benefit has not been proven, some believe that eating yogurt containing the Lactobacillus acidophilus bacteria will help prevent yeast infections.