Jaw stiffness or trouble opening your mouth
Muscle spasms, especially in the jaw, neck, back, or abdomen
Painful muscle tightening or rigidity
Trouble swallowing
Stiff neck
Stiff or rigid abdominal muscles
Fever
Sweating
Fast heart rate
Elevated blood pressure
Headache
Irritability or restlessness
Symptoms starting after a cut, puncture wound, burn, or contaminated injury
Worsening muscle spasms triggered by light, sound, or touch
Difficulty breathing
Seizure-like episodes
Recent wound with no up-to-date tetanus vaccination
Immediate medical evaluation if these symptoms are present