I wonder if anyone can put my mind at rest. I have been on high dose steroid inhalers for over 20 years to control my difficult asthma. However over the last couple of months it’s taken a turn for the worse and I have now been prescribed a 7 day course of 30 mg Prednisolone. Having read the instructions there is a warning about using them if you have an under active thyroid which I have and they can lower immunity! Is this also the case with a short course of steroids?