Offensive coordinator John Shoop could offer no answers following Chicago's sixth straight loss.
"I don't know what the problem is," Shoop said. "It wasn't the Eagles, it definitely was the Bears. Did we have offensive mistakes? Defensive mistakes? Physical errors? Mental errors? All I know is that we've got to find out the answer right now and get this team back on track."
The Bears also committed 12 penalties for 121 yards, which gave the Eagles eight first downs.
"We had the opportunity to win," he said. "Obviously there are games we like to be in like that. It was close, and we just fell short again. I think the guys were relaxed and ready to play. They were very focused. Still, we made all those mistakes. You can't do that and expect to get away with it. Crucial mistakes at crucial times will result in your getting losses. Basically, that's all it is."