Are Some Illnesses Harder to Be Healed Of Than Others?
It is no harder for God to heal you if you are a terminal cancer patient who also happens to have AIDS, a missing disc in your back and two kidneys that don’t work than to heal you if you have a pulled muscle. It is no less possible for you to receive your healing, because ALL things are possible to him who believes (Mark 9:23). So if you walk by faith and not by sight, no condition is harder than any other.
However, your flesh will not see things that way. Your ability to handle the harder cases will depend on your ability to minister out of your born-again spirit and not out of your unspiritual flesh.
A certain demon was harder to cast out for the disciples than other demons that the disciples had already cast out (Matthew 17:14-21). They already had the authority to cast out ALL demons (Matthew 10:1), so their authority to handle the situation was not the issue. However, their flesh might have freaked out when they saw the demon manifest. So there’s no limit based on the Word or based on your authority, but your success with a tougher case will depend on your ability to deal with The Flesh Freakout Factor. (Please read that section for a further discussion.)
When you receive healing for yourself, it’s easier to stand in faith for a condition like high cholesterol or high blood pressure where there may not be any severe physical symptoms than it is to stand in faith against a kidney stone that is causing so much pain that you can’t sleep and you just want to scream constantly. But you can receive your healing for all these conditions. Again, the difference with something like a kidney stone is that your flesh will constantly provide you with “information” that you aren’t healed until your healing manifests. But you can “dig in” and beat a kidney stone (I have) – it’s just harder and requires more “considering not your own body” than an ailment that might actually be more dangerous overall but that doesn’t cause as much immediate pain.
For a look at this same question from the perspective of the person who ministers healing, see Which Is Harder to Heal – Cancer or a Cold?.