Tailbone pain, known medically as coccydynia, most often comes from a direct injury, prolonged sitting, or strain on the small triangular bone at the very base of your spine. The coccyx is only three to five tiny fused vertebrae, but it bears a surprising amount of your body weight when you sit, which is why problems there can make everyday activities miserable. In many cases the cause is straightforward, but sometimes no obvious trigger exists at all.
The Most Common Causes
A fall directly onto your backside is the single most recognizable cause. Landing hard on the coccyx can bruise it, dislocate the joint that connects it to the sacrum, or in rare cases fracture it. The pain often starts immediately and worsens over the following days as inflammation builds.
Prolonged or repeated pressure is nearly as common. Sitting for long stretches while driving, cycling, or working at a desk puts continuous load on the coccyx. Over weeks or months, that steady pressure can irritate the joint, the surrounding ligaments, or the small disc between the coccyx and sacrum. Poor posture amplifies the problem because slumping shifts more of your weight onto the tailbone instead of distributing it across both sit bones.
Other frequent triggers include:
- Pregnancy and childbirth. During delivery, the ligaments around the coccyx stretch to make room for the baby. Pushing can strain or partially displace the bone, leaving pain that lingers for weeks or months postpartum.
- Joint hypermobility or stiffness. If the joint at the top of the coccyx is too flexible, the bone shifts excessively every time you sit. If it’s too stiff, it can’t absorb normal movement and takes more impact.
- Repetitive strain. Activities like rowing or indoor cycling that involve rocking back and forth on a hard seat can gradually irritate the coccyx.
Sometimes no cause is ever identified. You wake up one day with pain at the base of your spine and nothing in your recent history explains it. This is frustrating but not unusual, and the treatment approach is the same regardless.
How Body Weight Affects Your Tailbone
Your body mass index changes the mechanics of how you sit, and that directly affects your coccyx. Research published in Spine found that the pattern of tailbone injury varies significantly between people who are obese, normal weight, and underweight. Among obese patients with tailbone pain, 51% had a posterior dislocation of the coccyx, compared to about 15% of normal-weight patients and under 4% of thin patients. That’s because extra weight increases the force on the coccyx during sitting and can lever the bone backward out of alignment.
Being underweight carries its own risk. With less natural padding over the buttocks, the coccyx sits closer to the surface and absorbs more direct pressure against hard chairs. Thin patients were more likely to develop bony spurs (small pointed outgrowths on the coccyx) rather than dislocations. So the pain may feel similar, but the underlying problem differs depending on your build.
What Tailbone Pain Feels Like
The hallmark is a deep, aching soreness right at the base of the spine that gets worse when you sit, especially on hard surfaces. Leaning back in a chair tends to increase the pain because it presses the coccyx into the seat. Transitioning from sitting to standing often produces a sharp spike that fades after a few seconds. Some people also notice pain during bowel movements or sex, since the pelvic floor muscles attach directly to the coccyx and tighten during both.
The area may feel tender to direct touch. If you press a finger over the lowest part of your spine, just above the crease of the buttocks, and the pain reproduces exactly, that’s a strong signal the coccyx itself is the source.
When the Cause Is Something Else
Most tailbone pain is mechanical, meaning it comes from the bone, joint, or surrounding soft tissue. But occasionally the pain originates from a nearby structure and just feels like it’s coming from the coccyx. A pilonidal cyst, which is an infected pocket of skin and hair near the top of the buttock crease, can mimic tailbone pain but usually comes with visible swelling, redness, or drainage. Pelvic floor dysfunction, where the muscles of the pelvic floor become chronically tight or spasming, is another common source of pain in the same region.
Rarely, a tumor called a chordoma can develop at the base of the spine. This is uncommon, but pain that worsens steadily over weeks without any injury, or pain accompanied by numbness, bowel or bladder changes, or unexplained weight loss warrants prompt medical evaluation.
How Tailbone Pain Is Diagnosed
A physical exam is usually the starting point. Your doctor will press on the coccyx externally and sometimes internally (through the rectum) to pinpoint tenderness and check for abnormal movement. If the exam suggests instability or a fracture, imaging comes next.
Standard X-rays can show fractures, dislocations, and bony spurs. A more useful technique is dynamic X-ray imaging, where one image is taken while you’re standing and another while you’re sitting. Comparing the two reveals how much the coccyx moves under load. Normally the coccyx flexes up to about 22 degrees when you sit down. Hypermobility is defined as more than 25 degrees of flexion, and subluxation (partial dislocation) as more than 25% translation of the bone between the standing and sitting views. These measurements help guide treatment decisions.
Treatments That Work
The good news is that most tailbone pain improves without surgery. The first line of treatment is simple: reduce the pressure on your coccyx. A wedge-shaped or donut-shaped cushion with a cutout at the back takes your weight off the tailbone when you sit. Leaning slightly forward while seated also shifts load onto your thighs and away from the coccyx. These adjustments alone can make a noticeable difference within a few weeks.
Over-the-counter anti-inflammatory medications help control pain and reduce swelling around the joint. Applying ice to the area for 15 to 20 minutes several times a day is useful in the early stages, while heat may feel better for chronic, lingering pain.
Pelvic Floor Physical Therapy
If basic measures aren’t enough, pelvic floor physical therapy is one of the most effective next steps. A therapist works on releasing tension in the muscles that attach to the coccyx, improving mobility of the joint, and correcting posture habits that contribute to the problem. In a study of 79 patients with chronic tailbone pain who completed an average of nine physical therapy sessions, the mean pain score dropped from about 5 out of 10 to under 2, and the mean worst pain score fell from nearly 9 to under 5. Patients reported an average global improvement of roughly 72%. Notably, physical therapy helped even patients who had already undergone surgery, suggesting it addresses muscular and postural factors that other treatments miss.
Injections for Persistent Pain
For pain that doesn’t respond to physical therapy and lifestyle changes, a nerve block targeting the ganglion impar (a nerve cluster near the tailbone) can provide relief. In a study of 83 patients who received these injections, nearly 88% of the procedures produced an immediate reduction in pain of more than 50%, and complete pain relief occurred in about 54% of cases during the hour after the injection. The limitation is that the relief is typically short-lived. Repeated injections can offer moderate intermediate-term benefit, but they work best as part of a broader treatment plan rather than a standalone fix.
Surgery as a Last Resort
Surgical removal of the coccyx (coccygectomy) is reserved for cases where conservative treatment has failed for at least six months. It’s a relatively small operation, but the recovery period can be several weeks, and the surgical site sits in an area prone to wound complications. In a small single-center study of 14 patients, one developed a wound infection and another had the wound partially reopen. Because of these risks and the strong success rates of non-surgical approaches, surgery is genuinely a last resort.
How Long Recovery Takes
Mild tailbone pain from a bruise or strain often resolves in a few weeks with cushioning and activity modification. More significant injuries, like a partial dislocation, can take two to three months to settle down. Chronic coccydynia, where pain has persisted for months or longer, typically requires a more structured approach with physical therapy and sometimes injections, but most people see meaningful improvement within two to three months of consistent treatment. The key is reducing the aggravating factors early. Continuing to sit on hard surfaces without a cushion or ignoring posture habits will extend recovery significantly.