Premenstrual leukorrhea is a normal phenomenon, which is caused by the influence of hormone levels in the body. If the leukorrhea increase and leukorrhea odor, vulvar itching is abnormal, if the leukorrhea volume, yellow, foamy, thin texture, is also abnormal, most of the bacterial vaginitis or trichomoniasis vaginitis caused. If the amount of leukorrhea increased and thick, may be taking estrogen or in a more nervous state will occur, if the leukorrhea like tofu dregs change is also an abnormal situation, mostly due to mold infection. Women in the pre-menstrual period when there is an increase in leukorrhea should observe the color, texture, smell and other abnormalities, if there is an abnormality should be promptly to the hospital to do routine examination of leukorrhea, a clear diagnosis and timely treatment.