They are related insofar as both result in partial hair loss that.
Androgenetic alopecia, or male pattern baldness, is the more common a better understood of the two.
It is progressive in onset, and affects a laterally symmetric area, correlated inversely in distribution to the slope of the underlying scalp.
It has multiple risk factors, from hormone balance to that of the scalp's microbiome, and others; primarily driven by genetic and epigenetic components, which may indicate other risk-factors.
Alopecia areata however, tends to be more sharply, and less predictably localized — in both space and time, with no propensity toward lateral symmetry.
It is thought to be neutral with respect to life expectancy, stemming from autoimmune response around hair follicles.
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