If menstruation is intermittent with a relatively small amount, it is often clinically due to the following reasons: 1. Pregnancy, some people still experience irregular vaginal bleeding with a particularly small amount when they come to menstruation after pregnancy. Especially in patients with ectopic pregnancy, this irregular vaginal bleeding can occur at an early stage. Therefore, it is recommended to do urine HCG test, and if necessary, blood can be drawn to check the blood HCG, to exclude the possibility of pregnancy in the clinic; 2, in the clinic is due to endocrine disorders, so this situation; 3, due to endometrial lesions, such as inflammation of the endometrium, cancer of the endometrium, atypical hyperplasia of the endometrium, may appear this kind of menstruation off and on, and the amount is relatively small. The symptoms of intermittent menstruation may occur. Clinical diagnosis can be made by ultrasound, blood test and sex hormone test.