But when Jesus knew it, he withdrew himself from thence: and great multitudes followed him, and he healed them all;
Matthew 12:15 (KJV)
The Bible tells us that Jesus is the same yesterday, today and forever. What He did two thousand years ago He is still doing today, and this includes physical healing. God does not use sickness to try and teach us lessons, but much rather is He the one who heals us. We receive physical healing in they same way we receive anything else from the Lord: by faith. This means we stand on the Word that says we are right now healed with His stripes regardless of how it looks or feels, and we continue in faith until the manifestation shows up.