According to Swart, fear is the most important emotion. It's also what she calls a sense of survival, along with anger, disgust, shame, and sadness. "They are like basic colors for emotions," she says, adding, "All of our feelings are combinations of the basic emotions. For example, jealousy is like love with anger."
Fear (at least clinically) is "more of a mental state," she says. While you can feel anxious, fear itself is more than an emotion, as it often encompasses a variety of physical manifestations, such as increased breathing and heart rates, trouble sleeping, and recurring negative thoughts.