Lockjaw (symptom of Tetanus)

Lockjaw, medically known as trismus, is a symptom of tetanus, a serious bacterial infection. It causes painful muscle stiffness, particularly in the jaw, making it difficult to open the mouth. This occurs due to a toxin produced by the tetanus bacteria, which affects the nervous system and leads to involuntary muscle contractions. Lockjaw can prevent swallowing and speaking, and it may also involve other muscles, leading to spasms and rigidity in the body. Immediate medical attention is critical, as tetanus can be life-threatening but is preventable through vaccination.