There seem to be a large number of research studies that support the idea that the symptoms of cancer can be mediated by psychological, rather than just medical, methods.

Question

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There is evidence to suggest that psychological interventions, such as cognitive-behavioral therapy and mindfulness-based stress reduction, can help alleviate symptoms associated with cancer, such as pain, anxiety, depression, and fatigue. These interventions can enhance patients' coping strategies, improve their quality of life, and even lead to improvements in physical health outcomes.

There Seem to Be a Large Number of Research Studies