Excessive fear of heights, elevators, climbing ladders, pinnacles, etc.; fear of sharp points.

This is one of the most common phobias in the general population.

People who have acrophobia are afraid of being on high floors of buildings or on the tops of hills or mountains. They often feel anxious when they approach the edge of bridges, rooftops, stairwells, and railings. Sometimes individuals fear and feel an uncontrollable urge to jump. They may have fantasies and physical sensations of falling even when standing on firm ground.

Those fears of being in elevators or on escalators, balconies, and stairways are probably related to the fear of heights; as is the fear of flying or falling.