Euphoria, a major part of manic episodes, is a high mood that feels like absolute joy and excitement. However, it tends to be extreme to a debilitating grade. Individuals with bipolar feel like they are on top of the world. Along with this comes an inflated sense of self, grandiose thoughts about skills or the world, or exaggerated perception of one's skills, sometimes to a delusional level. Euphoria appears alongside extreme distractibility, risky or dangerous behavior like, and rapid racing thoughts and speech. Rational reasoning does not exist.
For example, an artist during a manic episode may feel excited about beginning multiple projects at once, more than a person reasonably can, and find themselves working on them nonstop. Euphoria distorts their perception. They may feel a heightened sense of pride and happiness, perhaps believing their art will make them famous. At the end of the episode, without the euphoria, the individual may find a series of unfinished projects that lack sense or meaning.