Hormones are substances produced in our bodies to regulate our biological activities. Body development is controlled by Growth hormones, when we are faced by a threat or crisis stress hormones are released, maturation and function of our reproductive system is controlled by sex hormones etc. Hormones play an important role in our mental health, Hormonal changes clearly influence brain function and certain mental disorders, such as depression, are associated with, and may even result from, disorders of the endocrine system.

Reduction is female sex hormones in women during menopause can produce ,depression, and sexual problems. Hormonal imbalance can also occur during certain points of a woman's menstrual cycle as well as right after having a baby. Women may suffer from depression and other mental health problems during these times.

Alcoholism, drug abuse, gambling, or even eating disorders may be caused by imbalance in pleasure hormones that reward these behaviours.