Euphoria: A feeling of well-being or elation.
Euphoria is that excitement you get from getting a perfect score on a test, or attention from someone you have a crush on. It can come from a roller coaster ride or as the rush from a physical activity like downhill skiing, especially the first time. These feelings of euphoria are all healthy and natural.
What's not healthy or natural is taking drugs to feel "euphoric." Drugs of abuse artificially produce euphoria by manipulating your brain chemistry to make it seem that something exciting is happening. To get this feeling again, you may choose to use the drugs again-and again. And that can lead to craving and addiction.
Over time, the brain needs more of the drug to get the same feelings of pleasure. Why? The drug causes surges, like waves, of the brain chemical dopamine, which initially produce the euphoria. After repeated hits, though, the brain adjusts to this higher level of dopamine by making less of it and by reducing the number of receptors that can receive and transmit the signals it sends. Pretty soon, the drug abuser is taking the drug just to bring the dopamine functions back up to normal and to avoid the horrible craving that compels them to seek and use drugs even when their lives and health are falling apart. That is really the essence of addiction.
But the good news is that natural, healthy experiences of euphoria don't wreck the brain's chemistry. So think about what you do in life that makes you feel good. Spending time with friends, playing with your dog, doing sports, seeing a good movie? Any of these activities can create a natural euphoria by triggering the brain's reward system the way it was meant to work.
So don't let drugs fool your brain, and then wreck it.