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Secondary mania, also known as organic mania, is a variation of bipolar disorder that is caused by physical trauma or illness. Bipolar disorder has a one percent prevalence rate in the United States and secondary mania is likely a small subset of that percentage. Secondary mania exhibits symptoms similar to that of mania in bipolar I and bipolar II disorders. This includes an elevated mood or affect, psychotic state, accelerated speech, increased motor activity, irritability, and flight of ideas. A unique criterion for secondary mania is the lack of history of mental illness that causes mania, such as bipolar disorder. Unlike bipolar disorder, which has an average age of onset at 25 years, secondary mania has an average age of onset at 45 years. Little is known about secondary mania, as much of the research on it is case studies and retrospective accounts. However, it has been connected to several causes such as traumatic brain injury, HIV/AIDS, and stroke.