Fear of injection can cause sinus tachycardia, may be caused by nervousness, if there is no obvious adverse reaction, don’t worry, slowly the symptoms will be relieved on their own, if there is panic, chest tightness, dizziness and other symptoms, you can apply medication in advance to prevent sympathetic excitation. Injection can cause sinus tachycardia, mainly due to nervousness and anxiety or fear, stimulate sympathetic excitation caused by the majority of people in the injection through their own regulation of the symptoms will be relieved, and do not need to give medication. If you need to use drugs, it is recommended to go to the cardiology department, follow the doctor’s instructions to standardize the use of drugs.