Coccydynia: Causes, Symptoms, and Treatment

Coccydynia

Coccydynia is a painful syndrome localized in the region of the coccyx, the last bony segment of the vertebral column. It manifests as pain at the base of the spine, typically exacerbated by sitting, and predominantly affects women (F:M ratio of 5:1), with an estimated incidence of about 1 case per 100 visits for vertebral pain. Although it is a relatively common condition, it often remains underestimated and insufficiently treated.

Coccydynia can be very debilitating — making it difficult to sit, drive, or work at a desk — but it responds well to conservative treatment in most cases. A combined approach of manual therapy, pelvic floor exercises, and postural modifications leads to symptom resolution in 90% of patients.

Anatomy of the Coccyx

The coccyx is a small triangular bone located at the inferior end of the vertebral column, formed by the fusion of 3-5 rudimentary vertebrae (Co1-Co5). It is approximately 2.5-3.5 cm long and articulates superiorly with the sacrum via the sacrococcygeal joint.

Structure

• Sacrococcygeal joint: an amphiarthrosis (semi-rigid joint) with a fibrocartilaginous disc. In young individuals, it allows for approximately 25-30° of flexion/extension; with age, it tends to ossify.
• Intercoccygeal joints: between the coccygeal vertebrae, they can be mobile or fused.
• Ligaments: anterior, posterior, and lateral sacrococcygeal ligaments stabilize the joint.
• Coccygeal cornua: small bony prominences on the first coccygeal vertebra.

Related Structures

• Pelvic floor: the levator ani and coccygeus muscles insert directly onto the coccyx. The coccyx serves as a posterior anchor for the pelvic floor.
• Anococcygeal ligament: connects the anus to the coccyx (anococcygeal raphe).
• Gluteus maximus: some fibers insert onto the coccyx.
• Coccygeal nerve plexus: innervates the skin of the coccygeal region.
• Ganglion impar (Walther’s ganglion): a sympathetic ganglion located anterior to the coccyx.

Function

The coccyx performs several functions:

• Attachment point for pelvic floor muscles and ligaments.
• Support in sitting position: supports body weight when sitting, especially in a reclined position.
• Shock absorption: distributes load forces in a sitting position over a tripod formed by the two ischial tuberosities and the coccyx.

Causes

Traumatic Causes (most frequent)

• Fall on the buttocks: the most common cause (up to 50-70% of cases). A direct fall on the coccyx can cause fracture, dislocation, or contusion.
• Childbirth: the passage of the fetus through the birth canal can dislocate or fracture the coccyx, especially in difficult deliveries or with a macrosomic fetus. 10-20% of post-partum coccydynia persists beyond 2 months.
• Direct trauma: kicks, impacts during sports (skating, horse riding, cycling, rowing).
• Repeated microtrauma: prolonged sitting on hard surfaces, long-distance cycling.

Non-Traumatic Causes

• Coccygeal instability: hypermobility of the sacrococcygeal joint (dynamic subluxation in a sitting position). Diagnosed with dynamic radiography.
• Coccygeal stiffness: fused or ankylosed coccyx that cannot flex during sitting, concentrating forces on the tip.
• Morphological anomalies: retroflexed coccyx (bent forward), coccygeal spur (bony prominence).
• Obesity: high BMI increases the load on the coccyx in a sitting position — but excessive thinness (loss of gluteal fat pad) is also a risk factor.
• Coccygeal bursitis: inflammation of the bursa located between the coccyx and the skin.
• Infection: infected pilonidal cyst, perianal abscess.
• Neoplasms: rare, but to be excluded (chordoma, metastases).

Idiopathic Coccydynia

In 30% of cases, no specific cause is identified. In these cases, repeated microtrauma not recalled by the patient, chronic pelvic floor tension, or psychosomatic factors are suspected.

Risk Factors

• Female sex: the wider female pelvis exposes the coccyx more to load in a sitting position.
• Obesity (BMI > 30): increased load and shear forces on the coccyx.
• Excessive thinness (BMI < 19): loss of protective fat pad.
• Prolonged sitting position: office work, prolonged driving.
• Hard surfaces: rigid chairs without padding.
• Vaginal delivery: especially instrumental deliveries (vacuum extraction, forceps).
• Age: rare in children, more frequent between 30 and 60 years.

Symptoms

Characteristic Pain

• Location: pain precisely at the tip of the coccyx, in the intergluteal crease. The patient often points to the exact spot with a finger.
• Aggravated by sitting: especially on hard surfaces and in a reclined position. Pain progressively increases during prolonged sitting.
• Pain when transitioning from sitting to standing: the moment of getting up from a chair is often the most painful.
• Relieved by standing and walking.
• Aggravated by direct pressure: sitting on a hard cushion, cycling.
• Possible pain during defecation: due to pelvic floor contraction and coccyx mobilization.
• Pain during sexual intercourse (dyspareunia): especially in women.

Associated Symptoms

• Pelvic floor tension: hypertonicity of the levator ani and coccygeus muscles.
• Low back pain: pain radiating to the sacral and lower lumbar region.
• Postural changes: the patient tends to shift weight onto one buttock (asymmetrical posture) to avoid pressure on the coccyx.
• Impact on quality of life: difficulty working at a desk, driving, sitting in a restaurant, or at the cinema.

Course

• Acute coccydynia (post-traumatic): sudden onset after a fall or childbirth, intense pain.
• Chronic coccydynia: pain present for more than 2 months, often with periods of exacerbation and remission.
• Average duration: without treatment, symptoms can persist for months or years. With adequate treatment, resolution occurs in 80-90% of cases within 3-6 months.

Diagnosis

Anamnesis (Medical History)

Fundamental for identifying the cause:

• Traumatic event (fall, childbirth)
• Type of work (sedentary, cycling)
• Duration of symptoms
• Response to medication

Clinical Examination

• External palpation: direct pressure on the coccyx that reproduces the pain.
• Rectal examination: evaluation of coccyx mobility (hypermobile, rigid, deviated) and pelvic floor tension. It is the most informative examination and must be performed by a specialist physician.
• Inspection: exclude pilonidal cyst, fistulas, masses.
• Evaluation of the pelvis: asymmetries, muscle tensions.

Imaging

• Standard radiography (lateral projection): shows the morphology of the coccyx (retroflexed, subluxated, fractured).
• Dynamic radiography (standing and sitting): is the key examination. It compares the position of the coccyx in the two postures:

• Flexion > 25° between standing and sitting position = hypermobility (instability).

• Flexion < 5° = stiffness (ankylosis).

• Posterior subluxation in a sitting position = instability.
• MRI: indicated to exclude neoplastic, inflammatory, or infectious pathologies.
• CT: to evaluate complex fractures or morphological anomalies.

Differential Diagnosis

• Pilonidal cyst: swelling and redness in the intergluteal crease.
• Anorectal pathologies: hemorrhoids, anal fissure, perianal abscess.
• Sacroiliac pathologies: higher and lateral pain.
• Pudendal neuralgia: perineal pain with a neurogenic component.
• Neoplasms: chordoma (rare malignant tumor of the coccyx/sacrum).

Conservative Treatment

Immediate Measures

• Donut or wedge cushion: with a posterior cutout that relieves pressure from the coccyx. It is the first and often most effective measure. Use it always: office, car, home.
• NSAIDs: ibuprofen or naproxen for 2-4 weeks in the acute phase.
• Cryotherapy: ice applications (15 minutes, 3-4 times a day) in the acute phase.
• Avoid prolonged sitting: stand up and walk every 20-30 minutes.
• Sitting posture: sit slightly tilted forward to shift the load onto the ischial tuberosities.

Manual Therapy of the Coccyx

Manual therapy is one of the most effective treatments for coccydynia:

• Coccyx mobilization: external or rectal manual techniques (performed by a physical therapist or specialist physician) to restore mobility of the sacrococcygeal joint. Studies show an efficacy of 65-85%.
• Myofascial techniques: release of the levator ani, coccygeus, piriformis, and gluteus maximus muscles.
• Sacrum mobilization: correction of associated sacroiliac dysfunctions.

Pelvic Floor Rehabilitation

Chronic pelvic floor tension is present in most cases of chronic coccydynia:

• Pelvic floor relaxation: “reverse Kegel” exercises — conscious release of perineal muscles.
• Diaphragmatic breathing: diaphragmatic inhalation synergistically relaxes the pelvic floor. 5-10 minutes, 3 times a day.
• Piriformis stretch: supine, bring the knee towards the opposite shoulder. 30 seconds per side, 3 repetitions.
• Adductor stretch: butterfly position (Baddha Konasana). 30 seconds, 3 repetitions.
• Self-massage of the gluteus maximus: with a tennis ball, apply pressure to the gluteal trigger points.

Exercises

Pelvic Mobilization

• Cat-cow on all fours: alternate spinal flexion and extension, focusing on the movement of the sacrum and coccyx. 15 repetitions, 2-3 times a day.
• Pelvic tilt (posterior/anterior pelvic tilt): supine, alternate flattening and accentuating the lordosis. 15 repetitions.
• Pelvic circles: standing or sitting on a fitball, perform circular movements of the pelvis. 10 in each direction.

Core and Gluteal Strengthening

• Glute bridge: supine, lift the pelvis holding for 5 seconds at the top. 3 sets of 12.
• Clamshell: lying on your side, open your knees while keeping your feet together. 3 sets of 15 per side.
• Forearm plank: 3 sets of 20 seconds.
• Bird-dog: on all fours, extend opposite arm and leg. 3 sets of 10.

Instrumental Therapies

• Shockwave therapy (ESWT): growing evidence of efficacy in refractory chronic coccydynia. 3-5 weekly sessions.
• TENS: application of electrodes in the sacrococcygeal region for pain control.
• Ultrasound: anti-inflammatory and local analgesic effect.
• Laser therapy: anecdotal efficacy, limited evidence.

Infiltrations (Injections)

If conservative treatment is not sufficient after 6-8 weeks:

• Local infiltration of corticosteroid + anesthetic: in the coccygeal region (periosteal or intra-articular sacrococcygeal). Relief in 60-85% of cases.
• Ganglion impar block: injection of anesthetic into Walther’s ganglion (anterior to the coccyx under fluoroscopic guidance). Indicated in coccydynia with a sympathetic component.
• Injections can be repeated 2-3 times at intervals of 4-6 weeks.

When Surgery Is Necessary

The coccyx is a small triangular bone at the spine’s base formed by fused vertebrae, serving as an attachment point for pelvic floor muscles and supporting body weight during sitting. Coccygectomy (surgical removal of the coccyx) is reserved for cases of:

• Chronic coccydynia (> 6-12 months) refractory to all conservative treatments.
• Coccygeal instability documented by dynamic radiography.
• Severe and debilitating pain.

Results

• Success: 65-85% of patients report significant improvement.
• Complications: wound infection (10-20% — the surgical site is close to the anus), prolonged healing time.
• Timeline: complete recovery requires 3-6 months; normal sitting is not possible for the first 4-6 weeks.
• Coccygectomy should be considered only after the failure of all conservative approaches and after careful patient selection by a specialized orthopedic surgeon.

Prevention

• Sitting ergonomics: use ergonomic cushions if working seated for long periods.
• Active breaks: stand up every 20-30 minutes.
• Core and pelvic floor strengthening: prevents recurrences.
• Body weight: maintain a normal BMI.
• At-risk sports: use appropriate protection (skating, horse riding).

Frequently Asked Questions (FAQ)

Frequently Asked Questions

How long does coccydynia typically last?

The duration of coccydynia varies, but the condition generally responds well to conservative treatments. A combined approach involving manual therapy, pelvic floor exercises, and postural modifications often leads to symptom resolution in a high percentage of patients.

Are donut cushions effective for coccydynia relief?

Donut cushions, or coccyx cushions, can provide temporary symptomatic relief by reducing direct pressure on the coccyx during sitting. They are often utilized as an immediate measure within a broader conservative treatment plan managed by a physical therapist.

What are the common causes of coccydynia?

Coccydynia frequently results from traumatic events such as direct falls onto the coccyx, or from non-traumatic factors like prolonged sitting. Childbirth is also a notable cause, particularly in women, due to potential stress on the coccygeal region.

When is surgical intervention considered for coccydynia?

Surgical intervention for coccydynia is typically considered only after extensive conservative treatments have failed to provide adequate relief. The vast majority of coccydynia cases respond effectively to non-surgical approaches, including physical therapy and targeted injections.

Sources and Scientific References

1. Blanco-Diaz M et al. (2025). Physiotherapy approaches for coccydynia: evaluating effectiveness and clinical outcomes. BMC Musculoskelet Disord. 26:514. DOI | PubMed
2. Boeglin ER Jr (1991). Coccydynia. J Bone Joint Surg Br. 73:1009. DOI | PubMed
3. Sidiq M et al. (2025). Effectiveness of physical therapy interventions for coccydynia: a systematic review with a narrative synthesis. Arch Physiother. 15:77-89. DOI | PubMed
4. Nourani B et al. (2024). Transrectal osteopathic manipulation treatment for chronic coccydynia: feasibility, acceptability and patient-oriented outcomes in a quality improvement project. J Osteopath Med. 124:77-83. DOI | PubMed
5. Origo D et al. (2018). Osteopathic manipulative treatment in chronic coccydynia: A case series. J Bodyw Mov Ther. 22:261-265. DOI | PubMed