Thinning hair and balding are not necessarily unhealthy or unattractive, of course: think Yul Brynner, Andrei Agassi, Sean Connery. There's no need at all to treat hair loss or investigate drugs that promote hair growth.
Hair loss can be either natural or caused by disease. The most common hair loss is thinning of the hair caused by androgens (male hormones), Male Pattern Hair Loss, Most Common Hair Loss, Hair Caused.
