Learning Reiki self-care can benefit people who are healthy and those with chronic health conditions, whether it's diabetes, asthma, cancer, epilepsy, fatigue syndromes, depression, or heart disease, to name just a few.earning Reiki self-care can benefit people who are healthy and those with chronic health conditions, whether it's diabetes, asthma, cancer, epilepsy, fatigue syndromes, depression, or heart disease, to name just a few.