It is called bipolar illness and the bipolar means up and down. That's clearly what happens. When people are bipolar, they can go from severe depression to incredible exuberance and exhilaration. It is the movement back and forth that can cause problems and perhaps be extremely dangerous. When people are really up, they feel like they're all powerful, but when they go down, they can be totally depressed. One of the problems is if you have someone who is depressed and they rapidly gain energy, sometimes they act on it and they can cause harm to themselves.
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