All of humanity is sick. It needs healing. Over and over again, Luke points out that Jesus' work amongst us is to bring about real healing, the wholeness of the human condition. Luke comes across to me as a knowledgeable doctor. For the one thing that he clearly understands is that healing must come from within the one who is sick.
Good doctors know that.
They may not say it. But they know that they cannot heal you. They can only help you to create the conditions under which you might heal. They can prescribe the right medications. They can offer advice on lifestyle.