Covering the mind and body, the health field includes a vast array of topics. Here are some places to begin your search:
000s (Computer science, information, & general works):
100s (Philosophy & psychology):
131 Parapsychological and occult - mental health and healing the mind/body
150 Psychology
174.2 Ethics in medicine
200s (Religion)
204.3 Worship, meditation, yoga
201.76 Social problems and services (includes intersection of religion and health)
300s (Social sciences):
362.1 Social issues regarding people with physical illnesses
362.2 Social issues regarding people with mental illnesses
362.4 Social issues regarding people with disabilities
363.15 Healthcare
363.45 Illegal drugs
363.46 Abortion
400s (Language)
500s (Science):
570 Life sciences
571 Physiology
572 Biochemistry
573 Physiological systems in animals
574 Biology
575 Evolution and Genetics
576 Microbiology
599.9 Humans (zoology)
600s (Technology):
610 Medicine and Health
611 Anatomy
612 Human physiology
613 Personal health and safety
614 Public health
615 Pharmacology and therapeutics
616 Disease
617 Surgery, regional medicine, ophthalmology, otology, audiology
618 Gynecology and pediatrics
619 Comparative medicine
641.1 Nutrition
646.7 Management of personal and family life
649.3 Breastfeeding
649.4 Sleep and health (Alcohol, drugs, tobacco)
700s (Arts & recreation):
796 Athletic and outdoor sports and games
800s (Literature):
900s (History & geography)