The root of all illness is the soul's lovesickness. It longs to return to its Beloved Above and feels repulsion for the human form, its painful prison.
Two things, then, must be repaired and the body and soul will be healed:
The human body must open itself to become a holy temple for the Infinite God, Who desires it for His dwelling place.
The soul must learn to discover the Infinite God within that human form, the place where He wants to dwell.