Yeastrol Review Part-8 - Version 8.0 Yeast infection symptoms in women. 3 out of every 4 women get yeast infection. This should not be treated like other medical conditions which may have the same signs and symptoms. It is vital that this infection is treated at the earliest. Adult females get affected by yeast infections and it is important for them to get rid of this infection. Yeast is a fungus, and hence grows well in dark and moist areas like the female reproductive organ. Under normal conditions, women already have yeast in the female reproductive organ's area. Research has shown that yeast infection occurs at least once in the lifetime for 3 out of 4 women. When yeast starts to multiply without control, it is known as yeast infection. It takes place due to weakening of the women's immune system. The reason may be the antibiotics which were being used to treat any disease.