Everyone, whether or not he is a Christian, must expect a certain amount of sickness and discomfort to enter his life. Physical pain is universal. No one escapes it.
Father Seraphim (Rose) of Platina
Therefore, how much we suffer from illness, or how intensely, does not matter so much as how we understand these infirmities. The understanding is all. If a man supposes that life should be one long, luxurious “vacation,” then any amount of suffering that comes to him is unbearable. But if a man views life as a time of sorrows, correction, and purification, then suffering and pain become not only bearable, but even useful. St. Ambrose of Milan says of the Christian attitude toward sickness:
If the occasion demands it, a wise man will readily accept bodily infirmity and even offer his whole body up to death for the sake of Christ.
This same man is not affected in spirit or broken with bodily pain if his health fails him. He is consoled by his struggle for perfection in the virtues,” (Exegetical Works).