Tailbone pain in a 13-year-old child may be related to prolonged compression, trauma, and misalignment of the sacral joints. 1. Prolonged compression: If you sit for a long time, the tailbone area will be compressed for a long time, which will cause poor local blood circulation and cause pain. 2. Trauma: when the tailbone is traumatized, such as a fall, the local edema and inflammation will also show the symptoms of tailbone pain. 3. Misalignment of sacral joints: misalignment of sacral joints will compress the surrounding tissues and nerves, resulting in tissue edema, congestion, etc., causing pain. There may be other causes of tailbone pain in 13-year-old children, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then treated under the guidance of the doctor.