Chemical imbalances in the brain can cause these two disorders to occur. Dopamine, a compound present in the body as a neurotransmitter and a precursor of other substances including epinephrine, is a chemical in the brain is usually associated with schizophrenia, whereas, Serotonin, a compound present in blood platelets and serum that constricts the blood vessels and acts as a neurotransmitter, and Norepinephrine, a hormone that is released by the adrenal medulla and by the sympathetic nerves and functions as a neurotransmitter, are usually associated with depression. Too much or too little of these chemicals in the brain can cause wither of the two mental
