•Specific conditions:
–Depressive disorder
–Schizophrenia
–Bipolar Disorder
–Obsessive Compulsive Disorder
•Imbalances in neurotransmitter systems
•Hormonal Imbalances (like in the thyroid)
•Genetic Predisposition (it runs in families)
•Trauma
–Abuse
–PTSD
–Deprivation
–Brain injury