Adrenaline addiction.

People addicted to high levels of adrenaline in their blood tend to take part in extreme sports despite injuries and other negative consequences of their hobby. Under stress, we follow the "hit or run" reaction. But what good is it? In moments of stress, adrenaline is not the only hormone released, there is also norepinephrine, which causes a feeling of euphoria and happiness. Thus, an adrenaline junkie might endanger his or her life to provoke stress.