Tailbone pain, also known as coccydynia, can be caused by a variety of factors, including injury, repetitive stress, degenerative disk disease, bone spurs, nerve pain, pelvic floor dysfunction, or infections. However, it is also possible to experience tailbone pain without any injury. Some possible causes of tailbone pain without injury include:

• Cancer: In rare cases, tailbone pain may be a sign of cancer near the coccyx or metastatic cancer that has spread to the bones. Cancers most likely to cause tailbone pain include chordoma, prostate cancer, and colorectal (colon) cancer.

• Pregnancy and childbirth: During pregnancy, the ligaments and muscles around the coccyx can become stretched and strained, leading to pain. During childbirth, the coccyx can also be injured or bruised.

• Prolonged sitting: Sitting for long periods of time can put pressure on the coccyx and surrounding muscles, leading to pain.

• Poor posture: Poor posture can put extra pressure on the coccyx and surrounding muscles, leading to pain.

• Being overweight or underweight: Excess weight can put extra pressure on the coccyx and surrounding muscles, while being underweight can lead to less cushioning around the coccyx.

If you are experiencing tailbone pain without injury, it is important to see a doctor to determine the underlying cause and receive appropriate treatment. Treatment options may include physical therapy, medications, injections, or surgery.