A fear which has no rational basis and which is so severe that it interferes with the day to day functioning is called a Phobia.
A phobia is an excessive fear or anxiety related to specific objects or situations that are invalid to the actual danger they present. Phobias cause significant discomfort or irritation due to avoidant behavior and the anxiety that occurs when exposed to the phobic object or situation.
Its the problem which people faces and are very skeptical about it. It usually causes anxiety and make people out of breadth and fearful. But one can overpower this phenomena.
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