Can hand foot and mouth disease cause complications with severe copd?

Not directly, but. Indirectly any additional condition can make a person already weakened by severe COPD worse. A bad risk during HF&M is dehydration and that would make COPD symptoms worse - so be careful to keep hydrated - drink lots of water! Be sure of the Dx - definitely have an exam and advise the Dr of the COPD and any other illness + meds. I hope it improves soon. Best!