Those different disciplines can use the same tools, but often use different tools. Say you have high blood pressure. One may just get you to calm down and slow your heart rate. Another may use a form of energy to trigger your body to squeeze and release blood vessels to move a blockage. A third may use a different energy to destroy the blockage. And yet another might relax tension in other blood vessels to bypass it till the normal process deals with it.
In this particular case there is calling on higher powers to intervene. Being a willing conduit for those powers. Using your own energy. Or making a connection with the person to help them to fix the problem themselves. All different phenomena all called “placebo” by scientists who don’t have a framework to understand it.