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Hello and welcome – I’ve not seen any research that the flu vaccine suppresses TSH. Is your doctor planning to do follow up labs? If you have normal T3/T4 with suppressed TSH, that’s referred to as “subclinical hyperthyroidism”. It’s usually a “watch and wait” situation to see if T3/T4 go out of range as well. The exception is that your doc might recommend treatment if you are having hypER symtpoms or if you are at high risk for bone loss or heart problems.