A recent quote from the Ravens' medical staff that was brought to light by Coach John Harbaugh confirms what we all already know. Steve Smith is no normal human.
"He's [in] the Hall of Fame of pain tolerance. That's what our doctors told me". - John Harbaugh on Steve Smith, Sr.
I can't think of any other player who is simply 'day-to-day' with broken ribs, but that's Steve's current injury description. Plus, he still hasn't been officially ruled out for this week's divisional battle with the Browns. Although he might miss this week, I'd bet that he's back sooner rather than later.