And I Quote: August 24, 2008

Not all wounds are superficial. Most wounds run deeper than we can imagine. You can't see them with a naked eye. And then there are the wounds that take us by surprise. The trick with any kind of wound or disease is to dig down and find the real source of the injury. And once you've found it, try like hell to heal that sucker.
(Meredith Grey on Grey's Anatomy, "Where the Boys Are")