I know some causes of hair loss
- Kidney failure. I do not know how. But I know some kidney failure patients who lose significant volume of hair. Might be a side effect of dialysis. I do not know.
- Cancer. Though diseases are already part of your health section..
- Genetics. Apparently, men are more prone to baldness. Baldness is a sex-influenced hereditary mechanism.
Thanks for your addition bro. @abrahamcera.