 [ Symptoms ] i have hashimotos am i going to have heart problems within few years [ Disease ] upset stomach is not likely a side effect from the cortisone injection but cortisone can cause flushing or swelling of the skin do not be alarmed this side effect will probably subside however if you itch if redness appears or if you have difficulty breathing seek medical advice to make sure you are not having an allergic reaction to the injection if any of these symptoms becomes unbearable seek advice from your health care professional or your local pharmacist