phobia -
an anxiety disorder characterized by extreme and irrational fear of simple things or social situations; "phobic disorder is a general term for all phobias"
A phobia is an irrational, intense and persistent fear of certain situations, activities, things, animals, or people. The main symptom of this disorder is the excessive and unreasonable desire to avoid the feared stimulus. When the fear is beyond one's control, and if the fear is interfering with daily life, then a diagnosis under one of the anxiety disorders can be made.
OmegaWiki Dictionary
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phobia An irrational or obsessive fear or anxiety, usually of or about something particular.