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There are more than 200 classified forms of mental illness. Some of the more common disorders are -  clinical depression, bipolar disorder, dementia, schizophrenia and anxiety disorders. Symptoms may include changes in mood, personality, personal habits and social withdrawal.

Cortisol affects levels of another brain chemical called dopamine. Changes in dopamine levels are seen in schizophrenia, depression, and other mental disorders.

Electrical impulses and chemical signals carrying messages across different parts of the brain and between the brain and the rest of the nervous system. Neurotransmitters send chemical messages between neurons. Mental illnesses, such as depression, can occur when this process does not work correctly.

Mental illness symptoms can affect emotions, thoughts and behaviors. Confused thinking or reduced ability to concentrate. Excessive fears or worries, or extreme feelings of guilt. Extreme mood changes of highs and lows.

Although the exact cause of most mental illnesses is not known, it is becoming clear through research that many of these conditions are caused by a combination of genetic, biological, psychological, and environmental factors -- not personal weakness or a character defect -- and recovery from a mental illness is not

With support and treatment along with adequate recovery time, people with mental illnesses can lead full and productive lives.