When a woman sits down her tailbone hurts, there are two main causes: 1. Tailbone fasciitis. If the tailbone has had previous injuries, such as tailbone fracture, tailbone fracture, it will lead to the formation of sterile inflammatory lesions in the location of the fascia, when sitting or in the case of cold, it will produce further stimulation of the location of the fascia, leading to increased inflammation and the formation of pain in the tailbone area. 2, the tip of the tailbone is located in the fat pad, called the bursa. If the bursa is often stimulated, or sitting for too long, as well as the collision of external forces, easily lead to synovitis, synovitis will form inflammatory edema, but also stimulate the peripheral nerves around the painful sensation. Especially when sitting down, the fat pad will be stimulated by pressure, resulting in a more pronounced pain.