Hormones are chemical messengers that tell the body how and when to change. There are many types of hormones which have different jobs. For example growth hormones cause physical changes and are important during childhood and puberty. Sex hormones (like testosterone and estrogen) develop sexual characteristics (like breasts and pubic hair) and control sexual functions (like erections and vaginal discharge).Hormone imbalance can happen for no reason and cause illness but most are treatable.
Attribution: Straight Talk Foundation