I have already lost more than half the hairs on the top of my head. I have been reading on your blog, that it is normal to lose up to 100 hairs a day. However, given my current state of hair loss, does the number of “normal” hairs to lose decrease? In other words, since I have lost half the hairs on my head already, should I only be concerned now if I lose more than 50 hairs a day?? I ask this question largely because I am about to start taking Propecia and I want to guage an idea of what kind of benefits I can hope for. Thank you!
While it is normal to lose 100 hairs a day, there should be 100 other hairs growing at other parts of your head to replace the lost hairs. It is just difficult to find the growing hairs and easy to see the falling hairs. If you are bald and have lost 50% of the hair population, then you will cycle about 50 hairs per day, not 100, and that is what you will see on your pillow (if all of the hair loss was at night when you slept).
If you have considerably thinned and are still losing hair (100 or 50 or 20 hairs a day), you may have hair loss that is genetic in nature (male pattern hair loss). If this is the case and you are worried about this, you may consider having your scalp hair mapped for miniaturization to see the pattern and state of your hair health.