squatting down, walking up or down stairs, looking out of the window of a moving car or train). Vertigo is called height vertigo when the sensation of vertigo is triggered by heights. Height vertigo is caused by a conflict between vision, vestibular and somatosensory senses. This occurs when vestibular and somatosensory systems sense a body movement that is not detected by the eyes. More research indicate that this conflict leads to both motion sickness and anxiety. Causes
Traditionally, acrophobia has been attributed, like other phobias, to conditioning or a traumatic experience. Recent studies have cast doubt on this explanation. Individuals with acrophobia are found to be lacking in traumatic experiences. Nevertheless, this may be due to the failure to recall the experiences, as memory fades as time passes. To address the problems of self report and memory, a large cohort study with 1000 participants was conducted from birth; the results showed that participants with less fear of heights had more injuries because of falling.
There are numerous references throughout the film to fear of heights and falling. See also
Acclimatization
Fear of falling
Head for heights
List of phobias

Citations
General and cited sources
Sartorius, N.; Henderson, A.S.; Strotzka, H.; Lipowski, Z.; Yu-cun, S.; You-xin, X.; Strömgren, E.; Glatzel, J.;  et al. "The ICD-10 Classification of Mental and Behavioural Disorders Clinical descriptions and diagnostic guidelines" (PDF). World Health Organization. p. 114. Retrieved 23 June 2021. External links
"The scariest path in the world? ", a direct test, video shot on El Camino del Rey, approaching Makinodromo
"Fear of Heights"—A comprehensive guide with useful resources on Acrophobia known as Fear of Heights.