Well, I'm not sure, but whenever I generate Reiki into my hands for the purpose of healing, or practicing, heat comes out of my hands if I push energy through them, and my body temperature rises in general, but it doesn't make me feel too hot. I never really payed attention, but I think when I practice Reiki, I do breathe more deeply. Perhaps it is your body's natural 'Chi' energy circulating more efficiently that generates the 'heat' in your hands. Usually happens with improved chi circulation due to meditation, and focus. The energy begins to overflow and 'pool'. Especially the hands. If it doesn't feel like an uncomfortable heat, then that may very well be what it is.

Hope that helps.

Thanks guys.and can this make you a healer?

Thanks for the ling ally. George