Abad has struggled in two stints with the Astros this year, allowing four earned runs in one inning of work Saturday against the Red Sox. He has a 7.32 ERA in 29 games this year for the Astros. Fernando Rodriguez was called up from Triple-A Oklahoma City.
"He came in over the weekend complaining of some tightness in his elbow and shoulder, and the elbow resolved itself in short order," Astros general manager Ed Wade said. "He was very tentative throwing when he went out there in the afternoon today, and [head athletic trainer] Nate [Lucero] felt it would be a couple of days. It was the best thing to do, to put him on the DL and go from there."
Wade said he didn't expect Abad to be seen by any doctors. The move means Sergio Escalona is the lone left-hander in the bullpen for the time being.