Tetanus, also known as lockjaw, is a serious bacterial infection that affects the muscles and nerves in the body. Some common synonyms for tetanus include trismus, spasm, rigidity, and cramp. These words can be used interchangeably to describe the symptoms of this debilitating condition, which can include muscular stiffness, painful spasms, and difficulty swallowing or speaking. While tetanus is relatively rare in developed countries thanks to widespread vaccination efforts, it remains a significant public health concern in many parts of the world. Early diagnosis and prompt treatment with antibiotics and antitoxins can help to improve outcomes and reduce the risk of serious complications.