Is lockjaw a symptom of tetanus?

Yes. Tetanus is a serious, preventable, bacterial disease. Major symptoms include severe painful muscle spasm and stiffness of the neck and jaw. This is where the term "lockjaw" comes from. Patients also suffer from fever, chills, sweats, and trouble breathing. There is no cure, so prevention is key. Adults should receive tetanus vaccine every 5-10 years.