In no way "difficulty" is used as an adverb. Have + difficulty/problem + gerrund is an idiomatic construction which exists a lot more often than we would bother to think about. It's not wrong.
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AnonymousHi there !Curious. I thought I had heard that ad. It seems to me it said, "if you have difficult or painful swallowing". But it could have been "if you have difficulty or pain in swallowing". I'll have to li
I heard an ad on the radio today that suggested you call your doctor if "you have difficulty or painful swallowing".
CalifJim It seems to me it said, "if you have difficult or painful swallowing".It wouldn't surprise me in the least if that is what the ad actually does say.