Lots of people have touched on the placebo effect. The other key part is that having a negative outlook causes the release of stress hormones like cortisol which reduce immune function. As others have said, the reverse is true if positive mindset – lower stress hormones PLUS extra pain relievers and other helpful hormones.
It’s important to note that positive attitude is not a replacement for medical treatment, just an extra bit that helps you heal a bit faster and feel less awful while you’re unwell. More importantly, not having a negative attitude prevents the physiological damage caused by stress. If you can’t be positive, finding a way to be neutral is still going to be better for your immune system than being negative.
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