Due to the physiological anatomy of women, the position of the tailbone is relatively low compared to men, and the sacrococcygeal joint is physiologically protruding towards the back, which makes it easy to be injured on a daily basis, and during the whole pregnancy period, the sacrococcygeal joint and the surrounding tissues and ligaments are more likely to be squeezed and injured, which causes sacrococcygeal pain. It is important to avoid sitting and straining on a daily basis, and to consider getting a cushion with a special depression in the middle.