Fear of heights is a common phobia, and one that is often experienced intensely. In fact, the symptoms often mirror those of a panic attack, including trembling, sweaty palms, nausea, and dizziness. Some have this phobia because of a traumatic experience but research suggests that, for many others, this fear, and similar ones such as claustrophobia, is a consequence of being more acutely aware of their bodily sensations than others, and more likely to interpret those sensations as threatening, leading to negative thoughts about jumping, losing their balance, or having a heart attack.