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You need to talk to your doctor, or whomever prescribed the inhaler. What inhaler are you using? Any inhaler with corticosteriod in it (ex. Trelegy, Symbicort, etc. ) needs to have a mouth rinse and gargle after each use. Otherwise you are swallowing the corticosteriods and that can cause gastrointestinal issues. As far as a back pain from an inhaler, I have never heard of that side effect before. Please contact your medical provider. They can help you a lot more than I can for sure. Take care and God Bless!