Answer: He’s the one who sends the illness! Everything is done by the Creator.
Every day, from dawn to dusk, He brings various troubles, and we have to make efforts to somehow run away from them.
We understand that it is impossible to escape, but meanwhile we still appeal to Him and try to find out where He is hiding behind all of it. This is the purpose for the blows we receive. He sends us troubles to attract our attention.
Question: Does it mean that it makes no sense to ask Him to change all of this?
Answer: No, we need to ask only about one thing: revealing His Oneness to the world.
From the Kabbalah Lesson in Russian 9/2/18