It is not normal to have severe stomach pain from spontaneous miscarriage. This condition may be caused by the pregnancy tissue shedding from the uterine cavity, blocking the cervical opening and promoting the contraction of the uterus and causing severe pain. It is also possible that the pain is caused by infection in the pelvic cavity due to spontaneous miscarriage. If the pain is caused by obstruction of the cervical opening by tissue, it is necessary to do a uterine operation to remove the tissue in the uterine cavity completely, so that the stomach pain will gradually disappear. If the pain is caused by the presence of inflammation, you need to take oral anti-inflammatory drugs or intravenous infusion of anti-inflammatory treatment, with about ten days of medication, the inflammation will gradually subside pain will also disappear.