[4gotunameagain]

Any doctor will tell you that mentality is incredibly important in fighting (yes, fighting) diseases.

It is well known that your psychological state influences the immune system a lot, and even from anecdata, you can see that people rapidly deteriorate when they give up. It is not a coincidence all these terms are used.

Can all cancers be beaten by sheer will? Of course not.

But it does play a huge factor in many cases.

[mizaru]

https://www.cancer.org/cancer/survivorship/coping/attitudes-...

[master-lincoln]

>It is well known that your psychological state influences the immune system a lot, and even from anecdata, you can see that people rapidly deteriorate when they give up. It is not a coincidence all these terms are used.

citation needed. This meta study seems to not have found many biological links: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1361287/

[4gotunameagain]

https://doi.org/10.1016%2Fj.cobeha.2019.01.009

https://doi.org/10.1016/j.ejon.2003.09.003

https://doi.org/10.1080/16506078809455814

https://doi.org/10.1037%2F0033-2909.130.4.601

[master-lincoln]

the last link is the same study I linked to come to the opposite result of you :D

[4gotunameagain]

Why do I read the opposite?

  Brief naturalistic stressors (such as exams) tended to suppress cellular immunity while preserving humoral immunity. Chronic stressors were associated with suppression of both cellular and humoral measures  

  The more a stressor deviated from those parameters by becoming more chronic, however, the more components of the immune system were affected in a potentially detrimental way.