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Temporomandibular disorders (TMDs)

SNOMED: 191526005918 wordsā€¢Updated 03/03/2026
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Exam Tips

  • In OSCEs, link pain to function: TMD pain is usually provoked or modified by jaw movement; pain unrelated to jaw use is less typical.
  • Measure and document mouth opening (interincisal distance); persistent opening <25 mm with sudden onset supports disc displacement without reduction (closed lock).
  • Do not overcall isolated painless clicking: reassure that joint sounds alone are common and often normal.
  • Differentiate myogenous vs arthrogenous patterns by palpation findings (muscle tenderness vs joint line tenderness/click/crepitus).
  • Always screen red flags (neurology, unilateral mass/swelling, systemic illness, cancer/infection features) before settling on benign TMD.

Definition

Temporomandibular disorders (TMDs) are a group of musculoskeletal conditions affecting the temporomandibular joint (TMJ), masticatory muscles, and related structures rather than a single diagnosis. They typically present with pain linked to jaw function, joint sounds, and/or restricted mandibular movement, and are a major cause of chronic orofacial pain in primary care and dental settings.

Pathophysiology

TMD is multifactorial, with biomechanical loading, muscle dysfunction, joint internal derangement, and pain modulation changes interacting over time. Myogenous TMD involves peripheral nociceptive input from overactive/tender masseter and temporalis muscles, often amplified by parafunction and stress-related muscle tension. Arthrogenous TMD includes disc-condyle incoordination (for example disc displacement with or without reduction), synovial irritation, and degenerative cartilage/bony change, producing clicking, crepitus, or locking. In persistent disease, central sensitization and psychosocial comorbidity (anxiety/depression, other chronic pain syndromes) can lower pain thresholds and increase symptom burden out of proportion to structural findings. For revision of anatomy and disc mechanics, see a sagittal TMJ disc-condyle figure in your head and neck anatomy text.

Risk Factors

  • Female sex (higher incidence than males in most cohorts)
  • Young to middle adult age (incidence rises into early-mid adulthood)
  • Macrotrauma (for example chin impact, road traffic collision, sports injury)
  • Repetitive microtrauma/mechanical overloading of the jaw
  • Psychological distress (stress, anxiety, depression) and sleep disturbance
  • Comorbid chronic pain disorders (for example fibromyalgia, migraine, IBS, chronic widespread pain)
  • Inflammatory/connective tissue disease (rheumatoid arthritis, psoriatic arthritis, SLE, JIA)
  • Generalized joint hypermobility (recurrent subluxation/dislocation risk)

Clinical Features

Symptoms

  • Pre-auricular or jaw pain, often radiating to temple, cheek, teeth, ear, or mandibular angle
  • Pain worsened or reproduced by chewing, yawning, talking, or wide mouth opening
  • Intermittent or persistent jaw locking (including sudden 'closed lock')
  • Perceived clicking, popping, or grating sounds from the TMJ
  • Temporal headache provoked by jaw function
  • Otalgia despite no primary ear pathology
  • Difficulty chewing tougher foods; occasional reduced oral intake in severe pain

Signs

  • Tenderness of masseter/temporalis muscles on palpation (myogenous pattern)
  • TMJ tenderness on lateral pole palpation or movement
  • Reproducible click on opening/closing (suggestive of disc displacement with reduction)
  • Crepitus on movement (suggestive of degenerative intra-articular change)
  • Reduced maximal interincisal opening; marked limitation (<25 mm) suggests persistent closed lock
  • Mandibular deviation to affected side on opening
  • Pain reproduced by assisted or unassisted jaw movement

Investigations

Clinical diagnosis (history + focused TMJ/masticatory muscle examination):Pain modified by jaw function, reproducible tenderness/click/crepitus, and movement restriction support TMD subtype diagnosis
Red-flag assessment (head and neck, dental, ENT, neurological review):Absence of alarm features (for example unilateral persistent swelling, cranial nerve deficit, systemic inflammatory signs, suspected malignancy or sepsis) supports conservative TMD pathway
Orthopantomogram (if alternative bony/dental pathology suspected):May identify dental disease, fracture, gross degenerative change, or other mandibular pathology
MRI TMJ (specialist setting, persistent locking/diagnostic uncertainty):Defines disc displacement with/without reduction, joint effusion, and soft tissue internal derangement
Blood tests when inflammatory arthropathy suspected (for example ESR/CRP, autoimmune panel):Raised inflammatory markers or serological evidence may indicate systemic joint disease contributing to TMJ symptoms

Management

Lifestyle Modifications

  • Explain benign/recurrent nature in many cases; set expectations that pain severity may not mirror structural damage
  • Jaw rest from aggravating extremes (avoid wide yawning, gum chewing, hard/tough foods) with temporary soft diet during flares
  • Self-care physiotherapy: controlled jaw-opening exercises, posture correction, heat/ice according to response
  • Stress reduction and sleep optimisation; address anxiety/depression and other chronic pain drivers
  • Consider dental review for occlusal splint/night guard where bruxism or nocturnal clenching contributes
  • Reassure isolated painless clicking as a common normal variant that usually needs no intervention

Pharmacological Treatment

Simple analgesic

  • Paracetamol 1 g orally every 4-6 hours when required (maximum 4 g in 24 hours)

First-line for mild-moderate pain. Reduce maximum dose in low body weight/frailty/liver impairment; avoid duplicate paracetamol-containing products.

NSAID (oral)

  • Ibuprofen 400 mg orally three times daily with food (usual prescription maximum 2.4 g/day)
  • Naproxen 250-500 mg orally twice daily (maximum 1 g/day)

Use shortest effective course. Contraindications/cautions: active peptic ulcer, severe heart failure, significant renal impairment, NSAID hypersensitivity/asthma exacerbated by NSAIDs, third-trimester pregnancy. Consider PPI gastroprotection (for example omeprazole 20 mg once daily) when GI risk is present.

Topical NSAID

  • Diclofenac gel 1% applied up to four times daily to painful peri-TMJ area (avoid broken skin)

Can reduce systemic adverse effects versus oral NSAID; still consider NSAID contraindication history.

Chronic pain adjuvant (specialist/experienced prescriber use)

  • Amitriptyline 10 mg at night, titrating gradually (for example by 10 mg every 1-2 weeks) to typical 25-75 mg nightly if tolerated

Consider for persistent pain with sleep disturbance/central sensitization features. Safety: anticholinergic effects, sedation, falls risk, QT-prolongation risk, overdose toxicity; avoid with recent MI and use caution in cardiac disease, glaucoma, urinary retention.

Surgical / Interventional

  • Arthrocentesis for persistent painful closed lock or internal derangement not improving with conservative care
  • Arthroscopy for lavage/lysis or disc-related pathology in selected refractory cases
  • Open TMJ surgery (for example discectomy or joint reconstruction) only in severe refractory structural disease after specialist MDT assessment

Complications

  • Transition to chronic pain (>3 months)
  • Recurrent episodes of jaw dysfunction/locking
  • Psychological morbidity (anxiety, depressive symptoms, pain catastrophizing)
  • Reduced quality of life and functional limitation in eating/speaking
  • Occasional weight loss from prolonged painful chewing
  • Medication-related harm (NSAID GI/renal/cardiovascular adverse effects; sedative burden from adjuvants)

Prognosis

Overall outlook is favourable with conservative care: many patients improve over time and only a minority need procedural treatment. Symptoms are often episodic (single, recurrent, or persistent patterns), with recurrence more common than a single isolated episode; risk of chronicity rises with higher baseline pain, myogenous phenotypes, wider pain syndromes, older age at presentation, and psychosocial comorbidity.

Sources & References

šŸ’ŠBNF Drug References(50)

āœ…NICE Guidelines(1)

šŸ“–Textbook References(19)

  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 941)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 970)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1177, 1178)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1281, 1282)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1177, 1178)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 759)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1668)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 561, 562)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1281)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 562, 563)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 562, 563)[context]
  • Guyton and Hall Textbook of Medical Physiology (John E. Hall, Michael E. Hall) (Z-Library).pdf(pp. 170)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 887, 888)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1031)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 747)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1034)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 891, 892)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 888)[context]
  • [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 888)[context]

Sources

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