Euphoria (from Ancient Greek , from εὖ (eu), "well", and φέρω (pherō), "to bear") is a mental and emotional condition which makes a person feel extremely happy, excited, and carefree. These feelings are much stronger and more intense than what a human would normally feel. However, some natural human behaviors can cause brief states of euphoria. For example, people may feel euphoric for a short time after orgasm, when in love, or after a very important athletic achievement. Sometimes, people can also feel euphoria during certain religious or spiritual rituals, or while meditating. More often, euphoria is caused by certain psychoactive drugs, mental illnesses, or medical problems. Euphoria is the opposite of dysphoria.