The idea is that to heal more of this energy is needed at the diseased site on a person.
Pranic healing is augmenting the flow of the life force energy in a person's bio- electomagnetic field, or aura.
Photography has shown that this electromagnetic field becomes disrupted before didease is manifested. If the pranic energy flows are wrong, disease results.
Everyone has chakra's (energy centres) in the palms of their hands, and pranic healing is using the energy from these to sense what is wrong in their own or other people's electro-magnetic energy and to clear the blockages and correct it.