When a person is infected with tetanus, the early symptoms mainly include dizziness, headache, fatigue, decreased appetite, weak chewing, sore jaw muscles, some muscle tension, or some hyperactive reflexes. As the condition worsens, typical clinical manifestations occur, such as difficulty opening the mouth, a sardonic smile, opisthotonos or neck stiffness, muscle spasms, muscle rigidity, and in severe cases, respiratory weakness or respiratory arrest. Some patients may develop a fever after being infected with tetanus. Therefore, some tetanus patients do show symptoms of fever.