Hair today and gone tomorrow

RM1000 to the person who can give the most logical reason why hair drops. We're not talking male pattern balding because that's *wave hands* genetic and I'm not a male, so am not remotely interested in the whys of male balding. I mean to say, are we stressed? Is it the length of the hair what makes it drop? ( This is possibly ot proven to be very accurate.) Having chopped the mop off a few weeks ago..the hair loss remains persistent daily. At this rate *sniff* I shall no longer have a thick head of hair to be proud off:(