The study of how psychological factors such as stress and emotion influence the nervous system and immune function.
From Greek 'psyche' (mind) + 'neuron' (nerve) + Latin 'immunis' (exempt) + Greek 'logos' (study). The mind-nerve-immunity connection.
Psychoneuroimmunology proves your mind affects your body's defenses — chronic stress literally weakens your immune system, while positive emotions can strengthen it!
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