Euphoria is the experience of pleasure or excitement and intense feelings of well-being and happiness. Certain natural rewards and social activities, such as aerobic exercise, laughter, listening to or making music and dancing, can induce a state of euphoria. Euphoria is also a symptom of certain neurological or neuropsychiatric disorders, such as mania. Romantic love and components of the human sexual response cycle are also associated with the induction of euphoria. Certain drugs, many of which are addictive, can cause euphoria, which at least partially motivates their recreational use. A euphoriant is a type of psychoactive drug which tends to induce euphoria. Most euphoriants are addictive drugs due to their reinforcing properties and ability to activate the brain's reward system.

兴奋或刺激，是一种激动的心情与感受，一般是对发展的鼓励或活动的原因。在神经科学中指某种输入对神经元的膜电位的一种影响，这种影响使膜电位去极化，即向正值移动。兴奋性输入增高神经元发生冲动的可能性。

An exaggerated feeling of physical and emotional well-being not consonant with apparent stimuli or events; usually of psychologic origin, but also seen in organic brain disease and toxic states.