The body responds to physical, mental, or emotional pressure by releasing stress hormones (such as epinephrine and norepinephrine) that increase blood pressure, speed heart rate, and raise blood sugar levels. Evidence from experimental studies does suggest that psychological stress can affect a tumor’s ability to grow and spread. People who are able to use effective coping strategies to deal with stress, such as relaxation and stress management techniques within psychology, have been shown to have lower levels of depression, anxiety, and symptoms related to the cancer and its treatment (National Cancer Institute, 2015).

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