Climacophobia is the fear of climbing, especially using stairs. ==Causes and effects== Climacophobia is usually traced back to a negative experience, like falling down the stairs or having difficult time to climb stairs. The fear is also triggered by others, like witnessing somebody falling down stairs (ever in real visualization or through media)...
fear of falling down stairs
<psychology> Morbid fear of stairs or of climbing. ... Origin: G. Klimax, ladder, + phobos, fear ... (05 Mar 2000) ... 
Type: Term Pronunciation: klī′mă-kō-fō′bē-ă Definitions: 1. Morbid fear of stairs or of climbing.
Climacophobia is the fear of stairs.
climacophobia An excessive fear of stairs, of falling down the stairs, or of heights.