What Is Coccydynia? Causes, Symptoms & How It Is Diagnosed

You lower yourself into your desk chair and a sharp, stabbing pain shoots through the base of your spine. It happens every time you sit down. It happens when you stand up. It turns the simplest daily activities into something you dread. If this sounds familiar, you may be dealing with coccydynia.

Coccydynia is pain in and around the coccyx (tailbone), usually caused by trauma, prolonged sitting, or childbirth. It affects the very base of the spine and can range from a dull ache to sharp, debilitating pain. Most cases respond well to conservative treatment.

In this post, we will cover exactly what coccydynia is, the most common causes, the symptoms to watch for, and how your doctor will diagnose it. Understanding your condition is the first step toward finding the right treatment and getting back to a pain-free life.

What Is Coccydynia?

The Coccyx Explained

The coccyx, commonly known as the tailbone, is a small triangular bone at the very base of the spine. It is made up of three to five fused vertebrae and, despite its small size, plays an important role in weight distribution when you are seated. The coccyx also provides attachment points for ligaments and muscles of the pelvic floor.

The term coccydynia literally means “pain in the coccyx.” It comes from the Greek word kokkyx, meaning “cuckoo bird,” because the shape of the bone resembles a bird’s beak.

Who Gets Coccydynia?

Women are approximately five times more likely than men to develop coccydynia. This is due to a wider pelvis, which exposes the coccyx to greater pressure, and the risk of coccyx injury during childbirth. The condition is most common in adults between the ages of 40 and 60, although it can develop at any age.

Certain groups face a higher risk, including cyclists, horse riders, rowing athletes, office workers who sit for long periods, and people who are overweight.

How Common Is It?

Coccydynia accounts for approximately 1% of all back pain presentations in primary care. While that may not sound like much, it is significantly underdiagnosed. Many patients are told they simply have “tailbone pain” and are sent home without a proper treatment plan, which often leads to chronic symptoms that could have been avoided with earlier intervention.

Acute vs. Chronic Coccydynia

Acute coccydynia refers to symptoms lasting less than three months, usually following a clear traumatic event such as a fall. Chronic coccydynia describes symptoms persisting beyond three months, often with a less identifiable cause and a greater challenge to treat effectively.

What Causes Coccydynia?

Understanding what causes coccydynia is essential for directing treatment at the right source. In most cases, the cause falls into one of the following categories.

Trauma and Direct Injury

Falling directly onto the tailbone is the single most common cause of coccydynia. Hard landings on stairs, ice, or solid floors can fracture, dislocate, or bruise the coccyx. Contact sports, cycling accidents, and other impact injuries are also frequent triggers. Even relatively minor trauma can produce symptoms in individuals with a naturally hypermobile coccyx.

Childbirth

During vaginal delivery, the baby’s head places extreme pressure on the coccyx, which can result in fracture or subluxation (partial dislocation). Childbirth is one of the leading causes of coccydynia in women. Symptoms may develop immediately after delivery or appear weeks later. Instrumental deliveries involving forceps or vacuum extraction carry a higher risk.

Repetitive Strain and Prolonged Sitting

Cumulative microtrauma from prolonged sitting on hard or narrow surfaces is another common cause. Cyclists, office workers, and long-distance drivers are particularly susceptible. Unlike trauma-related coccydynia, this type has a gradual onset with no single identifiable injury event. Hard chairs, bleachers, and narrow bicycle saddles are among the most common triggers.

Idiopathic Coccydynia (No Known Cause)

Up to 30% of coccydynia cases have no identifiable cause. This is referred to as idiopathic coccydynia. It is more common in individuals who are overweight, as excess body weight increases pressure on the coccyx when seated. Importantly, the absence of a known cause does not mean the condition is untreatable. The same conservative approaches that work for trauma-related coccydynia are effective here as well.

Coccyx Hypermobility or Hypomobility

A coccyx that flexes too much (hypermobility) or too little (hypomobility) during the transition between sitting and standing can produce significant pain. This is only detectable on dynamic X-ray imaging (taken in both sitting and standing positions). Standard static imaging often misses it entirely, which is why many patients are told their scans are “normal” despite experiencing real symptoms.

Rare Causes

In uncommon cases, coccydynia may be caused by tumors (such as benign chordoma or metastatic deposits), infections, or pilonidal cysts in the sacrococcygeal region. Referred pain from sacroiliac joint dysfunction or lumbar disc herniation can also mimic coccydynia. These possibilities are rare but must be excluded, particularly when symptoms do not respond to standard treatment.

What Are the Symptoms of Coccydynia?

Coccydynia produces a distinctive set of symptoms that most patients recognize immediately once the condition is identified.

Primary Symptom: Localized Tailbone Pain

The hallmark of coccydynia is an aching, sharp, or burning pain at the very base of the spine. This pain is classically worse when sitting, transitioning from sitting to standing, and during bowel movements. Many patients describe it as a deep ache at rest that becomes sharp with direct pressure or movement.

Pain Triggered by Pressure

Direct contact on the coccyx, such as sitting on a hard chair, immediately aggravates symptoms. Many patients find they can only sit comfortably on a specially designed coccyx cut-out (donut) cushion. Leaning slightly forward when seated often provides temporary relief by shifting body weight off the tailbone and onto the thighs.

Referred and Associated Pain

Pain from coccydynia can radiate into the lower back, hips, and thighs. Some women also experience discomfort during sexual intercourse due to the coccyx’s proximity to the pelvic floor. Pelvic floor muscle tension is a common accompanying finding and is also linked to bowel symptoms, which are covered in detail in our companion post on treatment.

Impact on Daily Life

Chronic coccydynia can significantly impact quality of life. Patients frequently report difficulty driving, cycling, sitting at a desk, watching a film, or sleeping on their back. Many begin avoiding social activities and even miss work because they are unable to sit for normal periods. The mental health impact of chronic tailbone pain should not be underestimated, and early treatment can prevent this downward spiral.

How Is Coccydynia Diagnosed?

Proper diagnosis is the foundation of effective treatment. If you’re preparing for your first consultation about tailbone pain, here is what to expect.

Clinical Examination

Your doctor will begin by pressing directly on the coccyx to reproduce localized tenderness. This hands-on assessment is the cornerstone of coccydynia diagnosis. In some cases, a rectal examination may be performed to assess coccyx mobility from the inside. You should be informed beforehand if this is part of your assessment. Your gait, posture, and sitting and standing patterns will also be evaluated.

Imaging: X-Ray

A standard X-ray can detect fractures, dislocations, and bony abnormalities of the coccyx. However, a dynamic X-ray (images taken in both sitting and standing positions) is far more informative because it can reveal hypermobility that a static scan completely misses.

Most first-line X-rays are performed in standing position only. If your results come back as “normal” but you are still experiencing significant symptoms, ask your specialist about dynamic imaging.

Imaging: MRI Scan

An MRI is typically ordered when tumor, infection, or nerve involvement is suspected. It is not the first-line investigation for coccydynia but is essential for ruling out serious underlying pathology. An MRI can also identify disc problems at the L5/S1 level that may be contributing to tailbone-area pain.

Differential Diagnosis

Several conditions can produce symptoms that mimic coccydynia, including sacroiliac joint pain, lumbar disc herniation, pilonidal cyst, anal fissure, and levator ani syndrome. Coccydynia is often a diagnosis of exclusion, meaning these other causes must be ruled out first. This is one of the reasons diagnosis can be frustrating and delayed for many patients. Working with a specialist who is experienced in spinal conditions can significantly accelerate this process.

What to Expect at Your Appointment

Your initial consultation will likely include a detailed history of your symptoms (when they started, what makes them worse, any injury or childbirth history), a physical examination of the coccyx and surrounding area, and a discussion about imaging. Some patients are understandably anxious about the physical exam component. Your care team at Atlantic Brain and Spine will explain every step before proceeding and ensure you are comfortable throughout.

Red Flag Symptoms Requiring Urgent Review

Certain symptoms alongside tailbone pain warrant immediate medical attention: unexplained weight loss, fever or signs of systemic infection, night pain that wakes you from sleep (which may suggest a pathological cause), and bowel or bladder changes, leg weakness, or numbness, as these may indicate cauda equina syndrome.

When to See a Doctor

If you are experiencing persistent tailbone pain that has not improved after two to three weeks of self-care, it is time to see a specialist. Seek immediate medical review if you notice loss of bladder or bowel control, progressive leg weakness, fever with tailbone pain, or night pain that disrupts your sleep.

The vast majority of coccydynia cases are not serious and resolve fully with the right treatment approach. Early intervention leads to significantly better outcomes. Do not wait for the pain to become chronic before seeking help.