Four days after the menstrual period is clean and bleeding may be caused by ovulation bleeding, inflammation, endocrine disorders, gynecological organic lesions, which can be cured by observation, medication against infection, oral hormone, surgical treatment and so on. 1. Ovulation bleeding: some women in the menstrual cycle is relatively short, and menstruation time to keep in about 1 week, because the end of menstruation four days after the ovulation period, when the body estrogen level decreases, resulting in the endometrium of the uterus bleeding, belong to the normal physiological phenomenon, do not need to worry about it can be naturally improved, and do a good job of observation can be. 2. Inflammation: If the bleeding is accompanied by abdominal pain, it may be vaginitis, pelvic inflammatory disease, etc., you can take cefoxitin sodium, gynecological oral solution, adamantine capsules and other medications, or the use of clotrimazole ointment for local treatment. 3. Endocrine disorders: such as estrogen and progesterone secretion level is abnormal, may also appear menstruation clean four days and bleeding, the first need to take oral uterine blood for treatment, some patients also need to take estradiol valerate, dydrogesterone tablets and other drugs treatment. 4. Organic gynecological lesions: For patients suffering from endometrial polyps, uterine submucosal fibroids and other diseases, it is recommended to carry out hysteroscopic endometrial polyp or submucosal fibroidectomy. Different causes of treatment programs are different, it is recommended to improve the examination in a timely manner, under the guidance of the doctor for the reasonable use of medication.