Robert Griffin III is having an incredible season. Notice how I didn't add the "for a rookie" caveat — through four games, RGIII has been one of the league's best quarterbacks, leading the NFL in adjusted yards per attempt, which takes into account touchdowns and interceptions. You could argue that he's been the most efficient passer in the NFL, and that's completely ignoring his rushing prowess — he's tied for the top spot in TDs, and he's 16th in rushing yards. (This is among all runners, not just quarterbacks.)
But one thing became very clear over the Redskins' last two games: Griffin is getting abused. Between his constant rushing, the Skins' dodgy pass defense, and the nature of the pistol and option offenses — which, because they involve choosing whether or not to pitch the ball, tend to put the quarterback at risk even when he hands it off — Griffin absorbs far more hits than the average quarterback. And even on regular passing plays, RGIII has taken the second-most QB hits in the NFL, as well as the 9th-most sacks.
This video should give you a pretty good idea; it's all of the big hits Griffin sustained against the Bengals and the Buccaneers, soundtracked by a pretty appropriate song.