What should you know about the medical term lockjaw?

The term refers to difficulty opening the mouth because the muscles of the jaw become tight or spasm. In medical language, lockjaw is most closely associated with tetanus. Tetanus develops when toxins made by Clostridium tetani bacteria affect the nervous system, often after bacteria enter through a wound. The wound may be small or hard to notice, and tetanus does not spread from person to person.

Jaw tightness can also have other causes, including dental problems, irritation around the jaw joint, medication effects, or muscle injury. The word lockjaw by itself does not establish the cause. A clinician will consider recent wounds, vaccination history, other symptoms, and an examination.

If you have a wound that may have been contaminated with soil, dust, saliva, or animal waste, rinse it with clean running water and arrange prompt medical advice. Do not wait for jaw stiffness before asking about tetanus protection. A clinician may assess the wound, check your vaccination record, and recommend a vaccine dose or other preventive treatment when appropriate.

Do not force your mouth open or put objects between your teeth. If jaw tightness is accompanied by painful spasms, difficulty swallowing, or increasing stiffness, seek urgent medical assessment.

Get emergency help for trouble breathing, inability to swallow saliva, repeated or severe muscle spasms, rapidly worsening stiffness, or a loss of consciousness. These symptoms can affect the muscles needed for breathing and swallowing.

Contact a healthcare professional urgently if new jaw stiffness follows a wound, especially when your vaccination history is incomplete or uncertain. A wound that is deep, punctured, crushed, burned, or visibly dirty also deserves timely assessment, even when it looks minor from the outside.

You could ask: Could this jaw stiffness have a cause other than tetanus? Does my wound need cleaning or additional treatment? Am I up to date with tetanus vaccination? Which changes should prompt emergency care?