Q: Is it possible for every single hair on the scalp to miniaturize?
In fact, when most people experience hair loss, what actually happens is that the hair converts from terminal hair to vellus hair (meaning it miniaturizes).
This is why those men (and women) who experience hair loss - whether from male pattern baldness or such things as chemotherapy - they are left with what appears to be tiny fuzz where they used to have long hair.
The causes of miniaturization of the hair vary widely, from genetic factors, aging, prolonged illness, medical reactions, etc.
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Receding hair lines