Why did I have a spontaneous abortion?

Spontaneous abortion is caused by poor embryo quality, uterine deformity, intrauterine adhesions, endocrine abnormalities, bad living habits, severe anemia and heart failure of pregnant women, pregnant women will appear menopause, vaginal bleeding and lower abdominal pain and other symptoms, once uncomfortable symptoms, should be admitted to hospital in time for uterine color Doppler ultrasound examination.