Firstly, severe tetanus, if not treated in time, can be fatal. When infected with tetanus, the early symptoms mainly include dizziness, headache, fatigue, decreased appetite, weak chewing, soreness or cramping of the jaw muscles, or muscle tension. Of course, when tetanus is severe, it can manifest as difficulty opening the mouth, risus sardonicus, opisthotonos, and stiff neck. In severe cases, there may be difficulty breathing, respiratory arrest, and even cardiac arrest. If in this situation, we do not promptly carry out emergency treatment, the tetanus patient can die.