The problem of suffering is one of the most difficult subjects connected to faith. One of the resources we have in discussing this is C.S. Lewis. Whitney Dotson tackles this in an article in the Christian Herald.
Since we are only very young, we learn to become quite acquainted with physical pain. It exists even before we cut our first tooth, and, while unpleasant, comes as hardly a surprise as we grow older. Psychological and emotional wounds, no matter how common on the other hand, tend to continually jar us. There never seems to be a remedy powerful enough to ease the tears of anxiety or the burden which wreaks havoc on our blood pressure and digestive tracts. Perhaps this is what Saint Paul identified as the thorn in his flesh; perhaps each Christian, individually, must struggle with such a thorn.
You can read the full article here.