The uppermost part of the buttock groove generally refers to the uppermost part of the hip crack, which is the location of the tailbone, which is relatively sensitive and fragile. If pain occurs, it is usually caused by trauma, chronic strain, degenerative diseases and other factors, and can generally be relieved by physical or medication treatment. Common causes and treatment methods 1, trauma: because the joints between the caudal vertebrae are connected by fibrocartilage, the sacrococcygeal joints are combined into a gap, when the patient is caused by trauma and other factors that lead to changes in the physiological curvature, causing pain. At this time, X-ray examination can be carried out, and then traction treatment and other ways to slow down the pain symptoms; 2, chronic strain: long-term chronic strain will trigger edema, oozing, mechanization, spasm, degeneration of the tailbone and the surrounding soft tissues, and even fracture, dislocation and other abnormal symptoms of the tailbone, which will lead to the appearance of pain. At this time can be under the guidance of the doctor oral diclofenac sodium extended-release tablets, Panlong seven tablets and other drugs, combined with acupuncture, massage and other ways to improve the symptoms; 3, degenerative diseases: age or acute and chronic injury, will lead to degenerative joint degeneration of the sacrococcygeal joint, so that the joint activity is restricted, in the activity will produce tailbone pain. Such cases generally can not be cured, can be appropriate through acupuncture, massage and other ways to symptomatic relief; 4, infection: when the pelvic internal infection, the pelvic muscles and nerves may therefore produce reflex pain. It is possible to take some antibiotics orally under the guidance of a doctor, which has a significant effect on symptom relief; 5. Tailbone tumor: this disease is mostly seen in chordoma, chondrosarcoma or chondrosarcoma, etc., all of which can cause pain in their parts due to tumor compression, and the mass can be palpated during physical examination. Such diseases need timely surgery or radiotherapy according to their own conditions. Patients who have pain at the top of the buttock groove when pressed are advised to go to the hospital in time to improve the blood routine, X-ray, pathological biopsy and other related examinations to clarify the cause and then treat the disease.