Stoke have scored just four times in the league this season and Hughes is growing concerned, even though he remains happy with the number of chances they are creating.
He said: "We are struggling for goals but that was prevalent before I came here.
"It is something we are working on. In terms of chances we are still creating the same, if not more, given we are playing in a slightly different way.
"It is up to us to make sure we convert the ones we get.
"We had a number of chances here, a number of balls flashing across the six-yard box, just needing a touch to convert them, and Stephen Ireland had a great opportunity.
"They had a number of chances in the first half when we were a little bit passive in our work but, apart from the one at the death, they didn't create that many more."
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