From Neil  Schneiderman's Foreword:

Because behavioral medicine has been constructed based on the understanding of relationships among behavior, psychosocial processes, and sociocultural contexts, the field is well positioned to take a leadership role in informing future health care policies. The field of behavioral medicine appears to have a bright, important future....

A small sampling of entries from Encyclopedia of Behavioral Medicine:

Abuse, child; Active coping; Adherence; Adrenaline; AIDS; Back pain; Behavioral medicine; Benefit-risk estimation; Binge eating; Bogalusa Heart Study; Cachexia; Cancer prevention; Cancer, testicular; Children's Health Study; Chronobiology; Coping strategies; Database development and management; Death, assisted; Developmental disabilities; Diabetes; Disparities; Eating disorders; Ecosocial theory; Effect modification; End-of-life care; Epigenetics; Expressive writing and health; Fall risk behavior; Family practice/medicine;  Family, relationships;  Fatigue; Foot care; Functional somatic syndromes; Galvanic skin response ; Gender differences ; Gene-environment interaction; Genetic polymorphisms ; Genital herpes ; Hamilton Anxiety Scale; Headaches, types of; Health systems; Hearing loss; Heart failure; Heart rate; Illness behavior; Immune function; Insomnia; Integrative medicine; Ischemic heart disease; Kaposi sarcoma; Kuopio Ischemic Heart Disease Study; Learned helplessness; Lifespan; Lifestyle, sedentary; Lipid abnormalities; Loneliness; Lung function; Magnetic resonance imaging; Maternal stress; Mean (average); Medication compliance; Methodology; Mini Mental State Examination; National Cancer Institute; National Children's Study; Negative affect; Neuroendocrine activation; Nigh shift workers and health; Obesity; Occupational therapy; Organ transplantation; Osteopenia/osteoporosis; Oxytocin; Pain; Pain anxiety; Palliative care; Panic attack; Physical activity interventions; Placebo effect; Post-traumatic stress disorder;  Racism; Randomized clinical trial; Regression analysis; Resilience; Risk perception; Risky behavior; Secondary prevention; Selye, Hans; Self-medication; Self-monitoring; Stress test; Successful aging; Tachycardia; Theory of planned behavior; Therapy, physical; Tinnitus; Twin studies; Unipolar depression; Usual care;  Validity; Vasoconstriction; Vassopressin; Verbal Rating Scale; Weiss, Stephen M.; Women's health; Women's Health Initiative; Worry; Wound healing; Yoga; Zung Depression Inventory

Health psychology

Health promotion and disease prevention
Aging and quality of life
Nutrition and exercise.- Behavioral cardiology
Behavioral oncology
Behavioral orthopedics and sports medicine
Sexual and reproductive health
Adolescent and women's health
Chronic disease, pain, and disability
Psychoneuroimmunology
Stress and coping
HIV/AIDS
Public health
Epidemiology
Healthcare policy and administration
Genetics and genomics as they apply to risk factors and morbidity
Complementary and alternative medicine
Eating disorders, including obesity
Substance abuse and addictive behavior (alcohol, drugs, tobacco)
Depression, anxiety, other mental health issues
Behavioral medicine education and training
Behavioral medicine research methodology, design, implementation, interpretation, and reporting.