Male androgenetic alopecia, also known as male pattern hair loss, is the most common progressive hair loss in men. It affects over 50% of men over the age of 50. It may present as a widespread thinning of the hair, a receding hairline, or in some cases even complete baldness in men.

Androgenetic alopecia is caused by a combination of genetic and hormonal factors. The condition can be passed down by either parent and, therefore, it often runs in families.

Dihydrotestosterone (DHT) is the main hormone responsible for causing this condition. DHT causes the scalp to lose hair by changing the nature of the hair follicles on the scalp, causing hair to become progressively narrower, shorter and paler until eventually, the follicles stop producing hair completely.

Reference: