Menstruation after 10 days may be due to ovulation bleeding, endocrine disorders, cervical diseases and other reasons. 1. Ovulation bleeding: due to hormonal fluctuations, the uterine lining will shed a small portion of the uterine lining, there will be a small amount of bleeding, usually short bleeding time of 1-2 days, long for 3-5 days, usually do not need to deal with. 2. Endocrine disorders: the menstrual cycle is directly related to the endocrine function. Factors such as late night, tiredness, stress and so on can cause endocrine disorders, resulting in menstrual cycle disorders, short menstrual cycles, longer menstrual periods, and bleeding after the menstrual period is clean. 3. Cervical diseases: whether the bleeding is related to sexual life, if there is bleeding after coitus, it means that there may be problems on the cervix, whether it is cervical epithelial ectasia, whether there are cervical polyps, cervical lesions and so on. Patients should go to the hospital in time, under the diagnosis of the doctor to clarify the cause of the disease, according to different situations to take appropriate treatment.