Mild symptoms of tetanus allergy mainly manifest as skin redness, itching, and the appearance of rashes, some of which occur a few days after the tetanus injection, with redness and itching at the injection site or the appearance of some rashes. Severe tetanus allergies can cause chest tightness, irritability, pale complexion, profuse sweating, low blood pressure, and slow pulse. In severe cases, it can lead to cessation of heartbeat and breathing. Once an allergic reaction to tetanus occurs, the injection of tetanus should be immediately discontinued, a venous pathway should be established, and aggressive treatment with adrenaline, dexamethasone, and calcium agents should be administered for the allergy.