Typical symptoms of tetanus include headache and difficulty in opening the mouth, muscle cramps, difficulty in breathing and high fever. 1. Headache and difficulty in opening the mouth: Early tetanus symptoms include headache and difficulty in opening the mouth, as well as difficulty in swallowing and stiffness in the shoulders and neck. Difficulty in opening the mouth and swallowing is due to spasms of the biting and neck muscles, which may give rise to the typical “bitter smile”. 2. Muscle spasm: With the further development of the disease and the gradual spread of toxins, there will be muscle spasm in the neck, limbs, abdomen and back, and the typical “angular reflexion” may appear. There is also severe pain. Spasms are often induced by noise and light. 3. Difficulty in breathing: caused by muscle spasms, in severe cases, suffocation may occur. 4. High fever: Tetanus can cause high fever, accompanied by sweating, elevated blood pressure and other symptoms. Therefore, tetanus antitoxin should be routinely injected to prevent tetanus after a history of trauma. If any of the above symptoms occur, it is recommended to consult a doctor promptly and take active treatment under the guidance of the doctor.