Tetanus is a medical emergency that causes painful muscle stiffness and spasms, often starting with lockjaw and then affecting the neck, back, abdomen, and breathing muscles. It can become life-threatening because it may interfere with breathing and cause serious complications like airway spasm, pneumonia, blood clots, or death.

What it feels like

Symptoms usually begin 3 to 21 days after exposure, most often around a week, and the first sign is commonly trouble opening the jaw. People can also have trouble swallowing, sweating, fever, headaches, and sudden spasms that may be triggered by noise or touch.

Why it happens

Tetanus happens when Clostridium tetani spores get into a wound and make a toxin that attacks the nervous system, causing muscles to contract uncontrollably. It is not spread from person to person.

What treatment looks like

Treatment usually requires hospital care, wound cleaning, tetanus immune globulin, antibiotics, muscle-spasm control, and vaccination. Some people need breathing support if the spasms affect the airway or chest muscles.

When to get help

Seek urgent medical care right away if you have a deep or dirty wound and you are not sure your tetanus shots are up to date, or if you develop jaw stiffness or painful spasms. Early treatment matters because tetanus can worsen quickly and is far easier to prevent than to treat.

Prevention

The best protection is staying current with tetanus vaccination and getting prompt wound care after injuries. Booster timing depends on your vaccine history and the type of wound.

TL;DR: Tetanus makes your muscles lock up painfully, can affect breathing, and needs emergency hospital treatment.