What is the pain in the tail vertebrae in the third trimester of pregnancy?

During the third trimester of pregnancy, the uterus is obviously enlarged and the fetus gradually begins to enter the basin, which will compress the pubic symphysis. When the pregnant woman sits for a long time or stands for a long time, there will be symptoms of tailbone pain. Usually, massage or hot compress can be carried out to speed up blood circulation and relieve pain symptoms.