Tailbone pain when sitting is almost always caused by irritation or injury to the coccyx, the small triangular bone at the very bottom of your spine. The medical term is coccydynia, and it ranges from a dull ache to a sharp, stabbing sensation that gets worse the longer you sit. Most cases trace back to either a direct injury or the cumulative stress of prolonged sitting, and the majority improve with simple changes to how and what you sit on.
The Most Common Causes
Your coccyx sits right at the base of your spine, and when you sit down, especially on hard surfaces, it bears a surprising amount of your body weight. The two most common causes of coccyx pain are acute trauma and repetitive microtrauma. Acute trauma means a single forceful event: falling directly onto your tailbone, a hard bump during activities like snowmobiling or horseback riding, or childbirth, which can push or fracture the coccyx from the inside. Many people with tailbone pain can point to a specific fall or injury that started it.
Repetitive microtrauma is subtler. It comes from activities like cycling or, more commonly, prolonged sitting. Years of low-grade stress on the coccygeal joints can lead to degenerative changes and chronic pain. If you work at a desk or spend long hours in a car, this slow accumulation of pressure is a likely culprit. Bone spurs can also develop on the tip of the coccyx over time, either from repeated trauma or for no identifiable reason, and these tend to become a chronic source of discomfort.
Being overweight increases the load on your coccyx when seated. Conversely, being very lean can also be a risk factor because there’s less cushioning from the gluteal muscles and fat pad that normally protect the bone.
Why Women Are More Affected
Women experience tailbone pain more frequently than men, for a few reasons. The female pelvis is wider, which positions the coccyx in a way that exposes it to more direct pressure during sitting. Childbirth is a well-recognized cause, as the baby’s head can push against the coccyx during delivery, sometimes dislocating or fracturing it.
Pregnancy itself can set the stage even before delivery. Your body produces a hormone called relaxin, which loosens the muscles, joints, and ligaments throughout your pelvis to prepare for birth. While this is necessary, it also makes the coccyx and its surrounding structures less stable. Relaxin can alter your posture and leave the pelvic area feeling weak or unstable, contributing to pain that centers on the tailbone. Some women develop this pain during pregnancy and find it lingers well after delivery.
What Helps: Cushions, Posture, and Movement
The most immediate thing you can do is change what you’re sitting on. Specialty cushions designed for tailbone pain work by letting your coccyx “hover” over a cutout so it doesn’t bear your full weight. Two main types exist: donut cushions (with a hole in the center) and wedge cushions (with a triangular cutout at the back edge). Among patients who had a preference, they were roughly five times more likely to prefer wedge cushions over donut cushions. The wedge design also angles your pelvis slightly forward, which naturally shifts pressure away from the coccyx. That said, many patients didn’t strongly prefer either type, so it’s worth trying both if one doesn’t feel right.
Beyond cushions, leaning slightly forward when you sit takes direct pressure off the tailbone. Avoid sitting on hard, flat surfaces when possible. If you sit for long stretches, stand up and move around every 20 to 30 minutes. Even brief standing breaks reduce the cumulative load on your coccyx throughout the day.
Physical Therapy and Injections
When home strategies aren’t enough, pelvic floor physical therapy is one of the most effective next steps. In a study of 79 patients who completed treatment (averaging about nine sessions), pain scores dropped from roughly 5 out of 10 to under 2 out of 10. The average overall improvement was about 72%. Physical therapy for tailbone pain typically focuses on the pelvic floor muscles, which attach near the coccyx and can pull on it when they’re tight or in spasm. Stretching, manual therapy, and learning to relax these muscles can make a significant difference.
Corticosteroid injections directly into the area around the coccyx are another option, with reported effectiveness in the range of 60% to 75%. When injections are combined with hands-on coccyx mobilization (a technique where a clinician gently moves the coccyx to restore normal positioning), success rates have been reported as high as 85% in some studies.
For pain that persists despite these treatments, a nerve block targeting a specific nerve cluster near the base of the spine can help. Studies have shown meaningful pain relief in 50% to over 80% of patients, though the duration varies. Some people experience relief lasting several months, while others find the effect is more short-lived and may need repeated treatments.
How Long Recovery Takes
Tailbone pain is notoriously slow to heal. Mild cases from a single bruising event may improve in a few weeks with cushion use and activity modification. More established pain, especially from repetitive microtrauma or degenerative changes, often takes several months of consistent treatment. The physical therapy studies showing strong results involved an average of nine sessions, which typically translates to two to three months of weekly or biweekly visits.
Surgery to remove part or all of the coccyx (coccygectomy) exists but is reserved for severe, treatment-resistant cases. Most people find adequate relief through the nonsurgical approaches described above.
Signs Something More Serious Is Going On
The vast majority of tailbone pain is musculoskeletal and benign. Less common causes include tumors (both benign and malignant), infections, and inflammatory joint conditions. A rare type of spinal tumor called a chordoma can develop in the coccyx area, and cancers from other parts of the body, including the colon, rectum, and prostate, can sometimes spread to the lower spine.
Certain symptoms alongside tailbone pain warrant prompt medical attention:
- Unexplained weight loss or persistent fatigue alongside worsening pain
- A noticeable lump in the tailbone area
- Sudden weakness, numbness, or tingling in one or both legs
- Loss of bowel or bladder control
- Pain that wakes you at night or isn’t related to sitting or movement
- Persistent constipation or a sudden increase in swelling
Pain that only flares when you sit and eases when you stand is the classic pattern of straightforward coccydynia. Pain that is constant, progressive, or accompanied by any of the symptoms above points to something that needs further evaluation.