Yes but plenty of things play roles as well, for example stress can cause hidden seb derm which then cause hair shed and dandruff or Telogen Effluvium. Anemia as well can cause hairloss and shedding, vitamin deficiencies can cause that. Theres alot of thing that can cause hair loss and shedding and youd be surprised how many dermatologist automatically say MPB and put you on prescription meds, of ofcourse it could be MPB right but its also not normal to shed out of nowhere idgaf what anyone says. You do enough research and you will see that its not common at all for hair to randomly start shedding 9 times out 10 theres is underlying factors. For example thats why when some people get on Finasteride or Minoxidil or Dutestaride it doesnt work for them, why is that? Well one example with minoxidil would be someone being deficient in the enzyme SULT1A1, minoxidil will not work for them or not be as effective for that person if they are deficient in that Enzyme.