Because the female sacrum is wider and shorter, with a smaller forward tilt arc than in men, the female coccyx is more posteriorly displaced and prominent, and may be more pronounced in women with lean bodies. However, the protruding tailbone in some women can also be seen in pathological conditions such as osteophytes, trauma, and tumors. Therefore, when women have a protruding tailbone or accompanied by pain and discomfort and other symptoms, it is recommended that it is best to go to the hospital for timely consultation and examination to identify the causes, and then for symptomatic treatment to avoid delaying the disease. 1, congenital developmental malformations: the tailbone will appear congenital developmental abnormalities, such as the tailbone tip forward high protrusion in the shape of a hook, which leads to the phenomenon of local bone protrusion; 2, osteophytes: due to sedentary, strenuous, so that the tailbone area is subject to Compression and stimulation, can lead to local ligament calcification, abnormal hyperplasia, or the local formation of osteophytes, performance tailbone protrusion; 3, trauma: trauma can cause tailbone fracture, dislocation, etc.. If the fracture or dislocation appears to heal abnormally, it will also lead to a more prominent tailbone; 4, benign tumors: such as sacrococcygeal teratoma is a benign congenital tumor, located at the lower end of the spine, between the rectum and sacrococcygeal bone, is a benign anorectal tumor, is a congenital developmental abnormality misshapen tumor, may lead to a more prominent tailbone; 5, malignant tumors: malignant tumors stimulate the local surface will appear prominent, such as chordoma Occurring in the sacrococcygeal region, tumor tissue in the sacrococcygeal region can grow posteriorly to appear a huge elastic mass with appearance similar to tailbone protrusion, and grow anteriorly to appear symptoms of rectal and bladder irritation, such as urinary incontinence, constipation, sciatica, etc.; 6. Infectious diseases: such as tuberculosis of the tailbone, can show tailbone protrusion, but it is less common in clinical practice.