"This morning I got a call that he was having bad stomach pains," New York manager Joe Girardi said before Monday night's against Tampa Bay. "Unfortunately on his (26th) birthday. It will be a birthday I'm sure he'll never forget."
Girardi has no timetable for when Pena will return, but doesn't expect him to miss an extended period.
Infielder Brandon Laird was recalled from Triple-A Scranton/Wilkes-Barre.
Also, Girardi said reliever Rafael Soriano (right elbow inflammation) and infielder Eric Chavez (broken left foot) are scheduled to start minor league rehab assignments Tuesday night with Class A Tampa.
"Those are both good news," Girardi said.