If your period comes and goes, you need to rule out whether you are pregnant or not. Some people will have a small amount of vaginal bleeding when they are pregnant, which may be due to bleeding during the period of implantation, or due to miscarriage with preeclampsia. You can check the blood HCG, blood HCG more than 25IU/ml should be pregnant, at the same time need to check the progesterone, if the progesterone is low may also lead to a small amount of bleeding, you need to carry out birth control treatment. If you are not pregnant, you should have low menstrual flow and poor menstrual flow, which is related to endocrine disorders, you can check the sex hormone six, thyroid function, if it is endocrine disorders, you can take Yosmin to regulate the endocrine system, and then check the ultrasound of uterine adnexa to see the thickness of uterine endothelial lining, and you can check the hysteroscopy to see if there is any abnormality in the development of the uterus. Endometrial adhesion or cervical tube adhesion can cause poor menstrual flow, if there is adhesion, you can perform adhesion separation surgery.