"Euphoria is often colloquially used to define emotion and an intense state of transcendent happiness combined with an overwhelming sense of contentment. It has also been defined as an 'affective state of exaggerated well-being or elation'. Certain drugs, many of which are addictive, are known to produce a euphoric state, also referred to as the euphoric high. Certain natural rewards (associated with addictive behavior) such as physical exercise can also induce brief states of euphoria. Euphoria is also known to occur as a symptom of mania." ― (from Wikipedia)