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Some people sensitive to energy experience various levels or layers to
the energy field. Often these are referred to as subtle bodies.The term subtle body can also be used to refer to a person's energy system in general.
While there is much variation, many energy healers speak of the
following levels of the energy field, roughly in order (moving outward
from the physical body), with each level being a more refined form of
energy. In most systems of energy healing, these various layers are conceived of as both surrounding and permeating the physical body.
You might feel an "edge" in one or more places, a bit of electric feeling or just "something" as one layer or body ends and another begins. Or you may just become aware that at some point the sensations you're getting have changed. This would indicate that you have moved through one subtle body or layer and into another.
If there is a problem within a particular field, you might feel specific sensations related to that.
Don't worry, though, if you aren't able to pick out different layers of the energy system. You most likely will be able to at some point, and in the meantime, you can do energy work quite well without it.
Each of these bodies can be worked with separately in energy healing. Different schools of energy healing disagree about whether this is necessary.
Another energetic body I believe needs to be mentioned is the "pain
body," a concept put forward by Eckhart Tolle. It's not an energy body
in the same sense as those described above. As Tolle describes it, it
is a negative energy field, composed of the accumulated, unresolved pain
and trauma of your life, that occupies your body and mind. It's not you
-- rather it is an "invisible entity in its own right," almost like a
parasite, which temporarily becomes autonomous by the unconscious mind's
identification with it. It feeds on pain, and so creates painful
situations in your life (including violence, anger, emotional drama, and
illness), on which it feeds.
The pain body is disabled and dissolved by the consciousness of its host. It cannot stand up to the host's dis-identication with it.