Psychologists define phobias as disproportionate and debilitating fears

Psychologists define phobias as extreme and disproportionate fears that act as barriers to daily life. While fear is a vital emotion that protects humans from potential danger, it becomes a phobia when the reaction is debilitating and does not align with the actual level of threat.

Experts note that many common phobias, such as the fear of spiders or snakes, involve animals that pose minimal risk to humans. For instance, fewer than 10 people die globally from spider bites annually. Research suggests that while fear requires cognitive recognition of a threat, infants may show physiological signs of risk perception; a study from the University of Vienna found that babies exhibit pupil dilation when observing spiders or snakes compared to flowers or fish.

Psychologists view fear and phobia as a continuous variable. Normal fear is a universal experience, whereas phobias are characterized by their irrationality and the significant impact they have on an individual's ability to function.