The watery color of menstrual discharge may be normal, or it may be related to preeclampsia, endometritis, submucosal fibroids and other diseases. 1. Normal phenomenon, at the beginning of menstruation, the menstrual blood is discharged less, the color is lighter, the menstrual watery red, and slowly become darker, is a normal phenomenon, no special treatment. 2. Pre-eclampsia, if the development of the fetus is unstable and pre-eclampsia occurs, the watery color may be produced, but it is not a menstrual period. 3. Endometritis, endometritis stimulates the uterine lining, which may affect the discharge of menstrual blood, and the watery color of menstruation may occur when the amount of discharge is relatively small. 4. Submucosal fibroids, patients with submucosal fibroids, the uterine cavity segment area increases, the uterus contracts abnormally, which may lead to the blood discharge is affected, so such symptoms may occur. If such symptoms appear, you can consult a doctor for examination and symptomatic treatment to avoid aggravation of symptoms.