"I had a couple of spells where I got a little bit dizzy and I felt weak. I don't know where it came from," said Kuchar, who did not blame jet lag after flying to Canada from England.
"I've had plenty of time to get over the travel. Hopefully it's just something that passes real quick."
Kuchar missed out on a maiden major title on Sunday when fellow American Jordan Spieth produced a brilliant finish at Royal Birkdale.
Yet Kuchar, eager to move on from that stinging defeat, had four birdies over his first 11 holes at Oakville's Glenn Abbey Golf Club to move into contention but was undone by a double-bogey and bogey over his final seven holes.
Kuchar is scheduled to tee off in the second round on Friday at 1:25 p.m. ET (1725 GMT) alongside Bubba Watson and Graeme McDowell.
(Reporting by Frank Pingue in Toronto; Editing by Toby Davis)
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