Angels center fielder Mike Trout was relieved after an MRI on Wednesday revealed only inflammation in his back. Trout did not play in the Angels' 4-0 win after leaving Tuesday night's game in the second inning with mid-back discomfort. Trout is listed as day-to-day.

Trout sat out last Saturday and Sunday with upper-back stiffness yet decided to play through discomfort in the series opener with the Astros. Trout described his pain level as a "six or seven" on a 10-scale Tuesday and, after striking out and playing an inning in center, opted to pull himself from the game. His back improved Wednesday.

"It actually does (feel better)," Trout said. "But it felt better two days ago and then it acted up a little bit.

"I don't want to go out there and re-aggravate it and keep playing like that for the rest of the year. I want to get it right before I go out there."

Trout recalled having lower-back pain during his days in the minors, but those issues cropped up after some sort of jarring collision. He is at a loss for why his back is aching presently, and he is committed to a new stretching program and a more judicious approach moving forward.

"(Tuesday) before the game I still felt it. I was trying to see if I could go and play," Trout said. "It's one of those things where I know if I don't feel it at all I can play. If I feel it a little bit, I should just be smart about it."

Manager Mike Scioscia said, "I think Mike as a young player, sometimes it's that experience that you need to understand exactly when you need a day and when you can go out there and play. He'll be fine."