The causes of vaginal flow of clear liquid secretion are as follows: 1. normal leucorrhea, after puberty, women are affected by estrogen in the body, the glands in the uterus, cervical glands, vaginal mucosa and vestibular glands start to secrete colorless, transparent and slightly viscous liquid, which is discharged from the vagina to form leucorrhea, this is a normal physiological phenomenon and does not need treatment. 2. during ovulation, due to high sex hormone levels in the body, resulting in This is a normal physiological phenomenon and does not need to be treated. 2, during ovulation, due to the high level of sex hormones in the body, the secretion of glands increases, diluting the sticky leucorrhea and shedding the uterine mucus plug, the leucorrhea can appear drawn, which facilitates the penetration of sperm. This is also a physiological phenomenon and does not require special treatment. 3, vaginal discharge is transparent and watery, accompanied by odor or itching, this is considered to be due to vaginitis or cervical inflammation to stimulate the leucorrhea increase, and at the same time, the change of sex, you need to seek medical examination and treatment, and also need to be alert to the possibility of reproductive organs tumors, because tumors can also cause leucorrhea watery change.