Jaw Pain & Bruising: TMJ, Bruxism, Trauma & Differential Diagnosis

Jaw pain with bruising suggests tissue trauma or chronic overload. Key etiologies:

1. Temporomandibular Joint Disorders (TMD)

• Disc displacement, degenerative joint disease, myofascial pain.
• Pain: preauricular, temple, jaw; clicking/popping/locking; headache.
• Bruising rare unless acute trauma/synovitis with capillary fragility.

2. Sleep Bruxism

• Rhythmic masticatory muscle activity (RMMA) during sleep.
• Morning jaw soreness, headache, tooth wear, masseter hypertrophy.
• Bruising possible from intense clenching → capillary rupture in soft tissue.
• Management: Occlusal splint (night guard), stress reduction, Botox (masseter), treat OSA.

3. Acute Trauma

• Direct blow, fall, MVA → fracture (condyle, angle, symphysis), dislocation, soft tissue contusion.
• Ecchymosis (floor of mouth, sublingual) = red flag for fracture.

4. Dental/Infectious

• Periapical abscess, pericoronitis → swelling, erythema, trismus.
• Osteomyelitis (rare).

5. Systemic/Neoplastic

• Giant cell arteritis (jaw claudication, scalp tenderness, vision threat).
• Malignancy (salivary, metastatic, osteosarcoma).
• Bisphosphonate-related osteonecrosis (BRONJ).

Evaluation

History, exam (palpation, ROM, cranial nerves, oral cavity), imaging (Panorex, CBCT, MRI for soft tissue/disc), labs (ESR/CRP if GCA suspected).

Referral

Oral surgeon, OMFS, TMJ specialist, rheumatology, neurology per findings.