Cleaning the aura will ultimately clean the negative energy or will fill your body with positive energy so that you can again feel healthy as before. It is said that we all are made up of energy and re-balance in energy will bring illness and poor health. So, energy is transferred from the practitioner to the patient through different ways of Reiki and hence the patient recovers and feels better. This universal energy is transferred in various ways and techniques which are taught to the practitioners in Reiki classes by those who have mastered the system.
However, still medical science does not approve Reiki to be as equivalent to conventional treatment methods for medical conditions that are serious and very critical and even for other minor conditions.
Further, I would share my own experience about this alternative healing method, how I have benefit from REIKI and Neurotherapy.