bipolar disorder
US /ˌbaɪ.poʊ.lər dɪsˈɔːr.dər/
UK /ˌbaɪ.poʊ.lər dɪsˈɔːr.dər/

1.
a mental disorder characterized by periods of elevated mood and periods of depression
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She was diagnosed with bipolar disorder after experiencing extreme mood swings.
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Living with bipolar disorder requires careful management and support.