Extreme mood and energy swings are symptoms of bipolar disorder, a mental health disease. Manic episodes, also known as mania, and depressive episodes are both common in people with bipolar disorder. Manic episodes are times when a person’s mood is abnormally high or irritable.The mood swings that everyone experiences on a regular basis don’t compare to these ones in severity. They may result in slowed thinking and acting, which can make it difficult for you to go about your daily activities.