This is really a magical treatment.Once you study this you will get healing power on your palms of your hand.Then they keep there hand on your body.There are strict places to keep and once the whole body is done they target the place where you have the difficulty.it really cures as i have studied it till the 2 nd level.Your headpain will go with in three minutes if the person who have studied this keeps on your head.its simply great.

Rei is stream and Ki is energy. Reiki is stream of energy.
Dr. Mikao USUI Invented reiki in early years of 19th centuri. he first started reiki clinic in 1922 in tokyo.
now there are many variation of reiki like karuna reiki, seichem reiki, teramai reiki, Osho Neo Reiki, Quantum Touch etc.
it is assumed that there is cosmic energy that drives all the world.
so when we get ill or ger disease our cosmic energy is low in that perticualr region of body. also advaced reiki healer use some imaginary symbols to enhance flow of energy.
with reiki practice one can heal that low energy part and bring it to high energy healthy part. principle is very simple and that is energy flowes from higher level (cosmic energy is alway high level) to diseased low level enegy. Healing person is just acting as conductor. he or she is not doing anything but only channeling reiki to patient.

with advanced level of reiki one even give energy to events or home or wishes. one must take part of this very useful handy healing technique.

--
Love Moves the world.

Reiki is a spiritual practice used as a complementary therapy developed in 1922 by Mikao Usui. After three weeks of fasting and meditating on Mount Kurama, in Japan, Usui claimed to receive the ability of 'healing without energy depletion'. Practitioners use a technique similar to the laying on of hands, which they say will channel "healing energy" (called "ki") through their palms. Neither the existence of ki nor any mechanism for its manipulation are scientifically accepted, and the evidence base does not support the efficacy of reiki, or its recommendation for use in treatment.
source wikipedia
http://en.wikipedia.org/wiki/Reiki