 The Bible is absolutely clear that demons cannot dwell within born-again believers. So, how can sickness dwell within believers? It's important to remember that while demons can attack with sickness, sickness itself is not a demon. One is a sentient being from another realm, the other is disorder or imbalance in the body. In the case of the believer, demons can send sickness into a believer but cannot themselves enter, like in the case of Job. Additionally, we actually see biblical examples of Christians who need healing from sickness. Apaphrodites was sick, Timothy was sick, and we even have the gift of healing for the purpose of ministering healing to other believers. Because the Bible draws distinctions between demons, sickness, how they can affect the believer, and how to deal with both, it's important to use discernment. In short, some sicknesses can be demonic attacks, but this doesn't mean that that's the case for every sickness. I give an in-depth look on this topic in my book, Holy Spirit the Bondage Breaker, available at bondagebreaker.com.