Which field studies how psychological factors such as stress influence the immune system and immune functioning?

1. Psychoneuroimmunology is the field that studies how psychological factors such as stress influence the immune system and immune functioning. 2. The term was first coined in 1981, when it appeared as the title of a book reviewing evidence linking the brain, endocrine system and immune system. 3. The field grew from the discovery of a connection between the central nervous system and the immune system. 4. Health psychology is the broader subfield studying psychological influences on health and illness, so it is wider than immunity alone. 5. Positive psychology studies qualities leading to fulfilled lives, and endocrinology is the study of hormones, so neither is the immunity field. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 14 "Stress, Lifestyle, and Health", section 14.3 Stress and Illness_