In which Reiki could also assist:

massage
reflexology
shiatsu
acupuncture
chiropractic
homeopathy
yoga
and many more complementary therapies

Reiki can also be used in conjunction with many therapies (medical, psychological, bodywork, etc.) to enhance the benefits and results that these modalities provide.

Once you get attuned to Reiki it is in your hands, anything you do will have the healing energy. Even after a treatment, Reiki will continue indirectly from the session.