Causes of sudden pain in the tailbone include trauma, exposure to cold, and pelvic urologic disorders. A fracture of the tailbone or a soft tissue contusion in the sacrococcygeal area can cause sudden pain in the tailbone area. Most patients have a clear history of trauma, and a definitive diagnosis can be made with x-rays or magnetic resonance imaging of the sacrococcygeal area. Symptoms can be relieved by oral para-steroidal anti-inflammatory medications and bed rest. Cold stimulation of the sacrococcygeal area can also cause aseptic inflammation of the fascia in that area, leading to sudden pain. Symptoms can be relieved by applying warm compresses or taking oral NSAIDs. Pelvic urologic diseases including urinary stones or torsion of ovarian cysts or rupture of corpus luteum in women can also cause sudden pain in the tailbone, which can be clearly diagnosed by ultrasound of the pelvic urologic system. If the symptoms worsen, you should go to the hospital in time, and standardize the treatment under the guidance of the doctor.