Showbiz
The 53-year-old fell ill while paddle-boarding with wife Camille near their Hawaii home on Saturday.
Publicist Stan Rosenfield said the actor is "resting comfortably" and will be released in the next few days.
Grammer, whose sitcom Back To You has been axed, was recently cast in a US remake of BBC comedy Roman's Empire.
More: Kelsey Grammer, Showbiz
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