Lockjaw is another word for the medical condition tetanus. Tetanus is caused by bacteria and causes stiffness in the jaw and neck. The bacteria which causes tetanus is found everywhere and is contracted by touching a contaminated item with a part of your body that is punctured or cut.
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Lockjaw is a common name for the disease tetanus. Tetanus is a bacterial disease that affects muscles and nerves, starting with stiffness in the jaw and neck. Tetanus can be deadly.