A closer look at the root of hair thinning
The most common cause of hair loss in men and women is androgenetic alopecia (AGA). Heredity, hormones, and age all play a part in this hereditary hair loss condition. In AGA, the hair follicle shrinks.
Each hair growth cycle produces a shorter, finer, much-less-visible hair. In time, a few follicles will even be destroyed, and thus incapable of producing hair.