I'm a medic mate, think I do know a thing or two about oncology. Once you have graded and staged the tumour, you know A LOT. I can't verify what the oncologist said via a third person, patients say a lot of random stuff they apparently heard but is misunderstood.
What type of cancer was it and where? What stage? What grade? Maybe your friend didn't ask many questions or you're unaware.
Why do they wear hats? Why do they take anti emetic tablets on chemo or put on certain creams? It's about managing the consequences that's why. Terminal people exercise too and date others. Again, why is this surprising?
Like I said I am not surprised he is wearing a hat so not sure what your point is. It's a give away someone having chemo with no hair in hospital, maybe he wants to hide his condition too. How many male pattern baldness people wear hats? I see loads of shaven around the UK or limited horseshoe. No body wears hats. There was actually research done in the UK and shave was at the top. So since they don't wear hats, it's ok to be bald?
Hair loss is the worst 'medical condition,' well that's to be expected on a hair loss forum. It can be psychologically damaging and socially especially in youth but most people don't lose so much so early. Nor do many people develop severe depression from it. Facts.
I believe my sig quote summarizes hair loss and how I feel. We on this forum are a minority in that we may worry more.