Boys and girls begin to grow hair under their arms and in the pubic area. As puberty progresses it will become thicker, darker and heavier. Boys will begin to grow hair on their faces. Another part of puberty is acne, it is caused by the hormones that are present during puberty. This is normal and everybody gets it.
Hormones are also responsible for the emotional changes that take place during puberty.
You may feel confused during puberty, have emotional outbursts, or strong emotions. You might be overly sensitive or easily lose your temper. There are those crazy hormones working on you again. Talk to a friend who is going through puberty too, he or she is probably experiencing the same thing. For girls, puberty can begin between the ages of nine to fourteen.