- Apr 28, 2009
I am a 14 male and have been feeling a hard lump beneath each nipple on my chest. They hurt...

Puberty is the time in which sexual and physical characteristics mature. It occurs due to hormone changes. The changes allow you to become capable of reproduction.
Adolescence is the period between puberty and adulthood.
Maturation - sexual; Adolescence; Reproductive development; Sexual maturation; Menarche; Adrenarche