I was in the medical ward in jail, and I asked a man with excruciating pain in his legs if he wanted me to heal him. I laid a hand on his leg.
He said no, but later that day, he suddenly stood up without howling in pain and got a big smile on his face. He didn't need the wheelchair again.
When there are medical solutions, use them, but faith healing is an option as well. Jesus did it, and said his followers would do greater works than Him.