Limited mouth opening (trismus) means the jaw cannot open fully. It can stem from joint, muscle, infection, trauma or post‑treatment changes. Clinical assessment helps identify the cause and direct appropriate specialist care.
Restricted mouth opening may result from temporomandibular joint (TMJ) disorders, muscle spasm or inflammation around the jaw, dental infections, facial or jaw trauma, or stiffness after oral or facial surgery. Radiation therapy to the head and neck, deep soft‑tissue infections and, less commonly, neuromuscular conditions can also cause trismus.
Limited opening can interfere with chewing, speaking and oral hygiene. Seek urgent evaluation if this problem occurs with rapidly increasing facial or neck swelling, trouble swallowing or breathing, high fever, severe worsening pain, active bleeding, or signs of facial deformity after trauma. In such situations contact emergency services or present to urgent care.
Initial evaluation is often provided by dentists, oral and maxillofacial surgeons or ENT (ear, nose and throat) physicians. Assessment may include a focused clinical exam, measurement of mouth opening, and imaging or laboratory tests when infection or structural injury is suspected. Physical medicine and rehabilitation, infectious disease or oncology teams may be involved depending on the underlying cause.
Maintaining good oral hygiene and attending regular dental care can reduce infection‑related causes. Avoid facial trauma and habits that strain the jaw. After oral surgery or radiotherapy, attend follow‑up care and perform recommended jaw mobility exercises if advised by a clinician to lower the chance of persistent stiffness.
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