The main view and perception of such techniques or methods is that the Self or Soul needs to be healed and balanced first, then the Body will be well too.
All diseases are the result of inhibited soul life.
Approaches with ancient spiritual schools behind, ie. You' is defined here by what you as a spirit are. Sometimes we find spirits attaching themselves to our auras for like reasons that don't seem like anything that is 'us'. They can be removed, but if one doesn't heal and intergrate that part of themselves another will only come to take their place for that like reason. We don't need extra burden in our lives when we are doing this, and having a non-claimed space can make us susceptible to that kind of burden.