Suffering exists, not because God created it, but because it is a side effect of our free will.
If we did not have free will, God would be a tyrant and we would be forced to worship (or not worship) Him. Because we do have free will, we often times choose bad things. This causes suffering. Mass shootings as an example are a horrible exercising of free will.
God wants us to choose Him and remove suffering but I choose against Him. I must amend my life for the salvation of the whole world.
God does not cause ailments upon us but they can be seen as an opportunity to become closer to Him. It is all about how you choose to accept His truth in reality or not. None of this creation, especially consciousness would exist if it were not for an intelligent creator. This much is obvious.