Our expert says:
As you have experienced, the use of cortisone in a diabetic, causes poor control of diabetes. I think that he should stop taking the cortisone. His symptoms can be due to a chronic allergic rhinitis with a post nasal drip, causing irritation. He can also be experiencing the irritation due to reflux of stomach acid. Medication like anti-hypertensive drugs, especially ACE inhibitors can cause a chronic cough.
Re-consult your doctor for further investigation.
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