Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Trismus
Medically reviewed by Min Clinic Staff | Updated: January 2026
Trismus: Inability to open the mouth fully. This may be due to spasm of the jaw muscles and be a symptom of tetanus (lockjaw). Or it may be due to abnormally short jaw muscles, as in the trismus-pseudocamptodactyly syndrome.