Ace Frehley will not be back, back in a New York groove ... instead he's laid up in a hospital bed.
The former KISS guitarist says he was admitted to a Pennsylvania hospital for exhaustion and dehydration ... after a concert Friday night.
Frehley is still hospitalized, and as a result had to cancel his scheduled show Saturday nigh in NYC, his hometown.
A message posted on his official website says Ace will head back to L.A. to recover once he's released from the hospital.
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