Because He Came ....
I can be healed.
1 Peter 2:24 (NKJV)
who Himself bore our sins in His own body on the tree, that we, having died to sins, might live for righteousness—by whose stripes you were healed.
Healing comes in many ways; miraculously, instantly, by use of modern medicine, or sometimes gradually. He heals in His timing. Don't give up!