The 53-year-old actor, best known from "Cheers" and his sitcom "Frasier," has checked into a hospital in New York after feeling faint, "Entertainment Tonight" said.
"(Grammer) is being treated for an irregular heartbeat, which we've learned could be a result of medication he was taking for his recent heart attack," the program said in a statement.
Grammer's spokesman Stan Rosenfield was not immediately available for comment.
Grammer felt chest pains while paddle-boarding with his wife in Hawaii last month where they have a second home and was taken to hospital where he was found to have suffered a heart attack. It came three weeks after he learned the Fox network was cancelling his new show, "Back to You," in which he played a womanising TV news anchor.
The star gained fame portraying the snooty but lovable psychiatrist Dr Frasier Crane for 20 years, first as a supporting player on the NBC comedy hit "Cheers" and then as the star of his own Emmy-winning spinoff series, "Frasier." – (Reuters Health)
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