One day after your period clears and comes again, it may be caused by the discharge of residual blood from the uterus. Normal menstruation is the regular shedding of the endometrium affected by the hormone level in the body. The fact that the menstruation is clean for one day and comes again is related to the incomplete shedding of the endometrium. If the amount of menstrual blood is small and quickly disappears, and there are no uncomfortable symptoms, there is generally no problem. If the menstrual blood comes again more, lasts longer and is accompanied by uncomfortable symptoms, it may be gynecological inflammation, endocrine disorders or lesions occurring in the uterus. It is necessary to go to the hospital for pelvic ultrasound to understand the situation of the uterine adnexa and gonadal six tests to understand the hormonal secretion, and then treat the symptoms. During the treatment period, we should pay attention to personal hygiene, forbid sex, spicy and stimulating food, and avoid heavy physical activities.