What causes male pattern baldness?

An inherited sensitivity of the scalp follicles to DHT. The hormone slowly shrinks those follicles, so the hair they grow gets finer and shorter until it stops.

How is male pattern baldness treated?

There is no cure, but you can slow it down and sometimes recover recent loss. Treatments run from prescription and over-the-counter options, used with medical advice, through to a transplant once the loss is established. What fits depends on the stage and an individual assessment.

Can hair grow back from male pattern baldness?

Follicles that are shrinking but still active can often respond to treatment, especially early on. Ones that have sat dormant for years will not regrow by themselves, though a transplant can refill those areas with DHT-resistant follicles from the back and sides.