If the menstrual flow is low and has not been completely cleared for 7 days, it is recommended to exclude the possibility of the following diseases: 1. The possibility of pregnancy must be excluded, and a blood test for HCG can be done to find out whether or not you are pregnant. Because some people who are pregnant will still have abnormal bleeding when they come to menstruation, they will mistake it for menstruation and ignore the possibility of pregnancy, which can be diagnosed accordingly through blood tests. If this is the case of pregnancy, blood HCG has been elevated, it is recommended that the clinical need to rule out biochemical pregnancy, or to rule out the possibility of ectopic pregnancy to do the appropriate checks to track. 2, in the clinical may also be endocrine disorders caused by this symptom, it is recommended that you can draw blood to check the sex hormone six, according to the results of the appropriate treatment.