NEW YORK • In a book about health symptoms called Am I Dying?! by Dr Christopher Kelly and Dr Marc Eisenberg, both affiliated with the Columbia University Irving Medical Centre in New York, the chapter on hair loss offers a simple description of the three stages of normal hair growth and how they might be disrupted.
Under typical circumstances, people have about 100,000 to 150,000 hairs on their heads, with each hair follicle going through its growth cycle independently.
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