He noted that if his back doesn't improve by Thursday or Friday, he will consider getting an MRI.
"I don't know a true timetable on what's going on right now," Adams said. "I feel better than I did yesterday. Yesterday I felt horrible. Hopefully, tomorrow I can come in and feel better and keep progressing day by day."
Adams, who has a 3.00 ERA with 19 strikeouts, 14 hits and six walks in 17 appearances this season, said he has never experienced an injury like this before and that it happened suddenly when he was fielding during the Phillies' batting practice Sunday.
"It was pretty painful. I was out there shagging, I went to go after a baseball and it just kind of grabbed at me," Adams said of his ailment. "I don't think it's nothing crazy, it wasn't like I was throwing and got hurt."
The Phillies have a day off on Thursday to give Adams extra rest before the Reds visit Citizens Bank Park for a three-game series this weekend.
Stephen Pianovich is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.