It is in the late teens and in early adulthood that there is a high risk of developing psychotic disorders such as schizophrenia and bipolar disorders.

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In particular, there's a strong genetic component to attention deficit hyperactivity disorder, as well as to several mood and anxiety disorders, including depression, bipolar disorder, and obsessive-compulsive disorder.

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Indeed, in the past, Pfizer (nyse: PFE - news - people ), the world's biggest drug company, owed much of the sales volume of its epilepsy medicine Neurontin to off-label use for pain and for disorders ranging from panic to bipolar disorder.

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The devices, which induce a seizure by delivering an electrical current to a patient's brain, are used to treat intractable cases of depression, as well as bipolar disorder, schizophrenia, and other mental disorders.

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The other most popular sites by number of members cover arthritis, heart disease, sleep disorders, pulmonary disease, back pain, depression, GERD and bipolar disorder.

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The DSM committees already tried their damnedest to support their diagnoses with neuroscience or biomarkers, but no lab tests yet exist for depression, schizophrenia, bipolar or obsessive-compulsive disorder, or, for that matter, any other mental disorders.

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