There are a variety of contributing factors to the onset of mental illness.  Studies show that there are biological, social, psychological, and environmental causes for mental illness.  Biological causes may include factors such as genetic make-up, traumas to the brain, misuse of substances, and certain vitamin deficiencies.  Social, psychological, and environmental factors may include living conditions, particularly living in poverty or social isolation, as well as family and community support and coping with traumatic experiences such as abuse, divorce, death and bereavement.