If the menstrual period comes and goes, and then comes again, if you are a married woman, you must rule out the possibility of pregnancy. If the blood test is positive for HCG, we suggest further examination, mainly to rule out the possibility of ectopic pregnancy, gravidity or pre-eclampsia caused by miscarriage, and according to the different results, give the appropriate treatment. If you are not pregnant, it may be caused by endocrine disorder or some gynecological tumors, such as polycystic ovary syndrome or endometriosis. In addition, if you have ever taken contraceptive drugs, you may also have this symptom. It is recommended to combine the clinical history with a comprehensive analysis and then use medication.