If you flash your back during pregnancy, you must be careful not to use some ointment that activates blood stasis, otherwise it may cause miscarriage or premature birth. Do not take drugs blindly, you need to go to the hospital in time and take some pain relieving drugs under the guidance of the doctor. You can have massage and tui-na in the rehabilitation physiotherapy room to relieve the pain. During the treatment period, you must pay attention to rest and no more strenuous exercise. If you have back pain and lumbago, you should first have an ultrasound to see if there is a pre-eclampsia. If it is determined that there is a pre-eclampsia miscarriage, you need to undergo fertility preservation treatment. During pregnancy, if you have discomfort, do not use medicine blindly, otherwise it may affect the development of the fetus. Especially the application of some drugs that activate blood circulation and remove blood stasis may cause miscarriage.