Sore throats are mainly caused by colds and upper respiratory tract infections, during which it is not possible to get a flu shot, mainly because the flu shot tends to cause a low-grade fever and general malaise. If you get a flu shot when you have a sore throat and a cold, it may aggravate your sore throat, cause a fever, or even cause an infection in your airway. Due to the sore throat, cold, the body’s resistance will also be reduced, at this time to inject the flu vaccine will also affect the preventive effect of the vaccine, will affect the production of antibodies, during this period can not be injected with the flu vaccine, this time you need to drink plenty of water, more rest and a light diet, wait until the symptoms improve before injecting the flu vaccine.