Miscarriages are divided into spontaneous and induced abortions, with most spontaneous abortions being early abortions. In contrast, menstruation is a phenomenon of periodic shedding of endometrium and vaginal bleeding that occurs every month or so. The two can be differentiated and diagnosed by the contents, the amount of bleeding and related examinations. The difference between spontaneous miscarriage and menstruation in terms of symptoms 1. contents: in miscarriage, white or pink flesh-like tissue may be seen along with vaginal bleeding; in menstruation, only dark black blood clots are seen in high volume; 2. color of bleeding: in miscarriage, the color of bleeding may be bright red or brown; in early menstruation, the bleeding is mostly dark black; 3. amount of bleeding: miscarriage can be manifested as a sudden small amount of bleeding or heavy bleeding; in menstruation The bleeding is usually stable and lasts for 3-7 days; 4. Precursory symptoms: menopause and even pregnancy reaction may occur before miscarriage; abdominal pain and back pain may only occur before menstruation. Self-test and examination after suspected miscarriage 1.Early pregnancy test: if the early pregnancy test is negative, it means normal menstruation; 2.B ultrasound: it can confirm the type of miscarriage; 3.Pregnancy test: continuous measurement of blood hCG level, if the growth rate is <66% within 48 hours, it can determine the poor prognosis of pregnancy; 4.Progesterone determination: by determining the blood progesterone level to assist in judgment.