There are several names to Energy Medicine - Reiki, Pranic Healing, Tai Chi, Qigong and probably several others. Those are the ones I am familiar with. All of them utilize healing and balancing of energy levels. There are subtle differences to all four kinds but there are many similarities. I believe they complement each other. My experience with all four are very positive and I am now actually in the advance level of Pranic Healing.
It is believed that before any problem is manifested in our physical body, there is already a change in our energy body. So if this can be corrected at this level (energy level), then it will no longer manifest physically. However, if something is already wrong physically, then healing the energy body will eventually lead to the healing of the physical body. However, this is not meant to replace western medicine as we know it. Rather it is meant to complement western medicine.
I hope I have answered your question.