Bipolar disorder

Note on usage: "Manic-depression" was the original term used for the disorder. While it is still commonly used to refer to bipolar disorder, the term manic depression is also now used (by a relatively small number of mental health professionals) to refer to the entire clinical spectrum of mood disorders that includes both bipolar disorder and unipolar depression. Others are trying to phase out the term entirely.

Environmental factors affecting mood in bipolar disorder

In mid-2003, a twin study was published concerning environmental factors and bipolar disorder. The bipolar twin was found to be far more affected by changes in sunlight. Longer nights resulted in mood and sleep-length changes far greater than the healthy twin. Sunny days also did more to improve mood. In fact, natural light in general was found to have a profound positive effect upon the well-being of the bipolar twin.{{ref|Hakk_2003}}

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Paradoxically, in the 2004 publication of a study using Tel Aviv's public psychiatric hospitals, it was found that "Admission rates of bipolar depressed patients increase during spring/summer and correlate with maximal environmental temperature".{{ref|Shap_2004}} Unipolar depressed patient admission had no such correlation. High temperature points in the month, as well as high temperature months, were found to be correlated with depressive episodes in admissions

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