Emotions are feelings that influence behavior and have physiological and cognitive components. There are four basic emotions: happy, sad, afraid/surprised, and angry/disgust. Emotions can be positive like joy or negative like fear. Primary emotions are instinctive responses to stimuli while secondary emotions involve feeling emotions about other emotions. Theories of emotion include the James-Lange theory that emotions arise from physiological reactions, the Cannon-Bard theory that physiological and emotional experiences occur simultaneously, and the Schachter-Singer theory that physiological arousal combined with cognitive labeling leads to emotion. Stress can be beneficial (eustress) or harmful (distress) and results from stressors