Friday the 13th as a day of ill luck is one of America's most popular superstitions. Do you suffer from triskaidekaphobia? ... Triskaidekaphobia, which means the fear of Friday the 13th, is derived from Greek words tris meaning "3," kai meaning "and," deka meaning "10" – and it's extremely common.

How do you know if you have triskaidekaphobia?

Excessive, unreasonable, persistent feelings of fear or anxiety that are triggered by the number 13. Feelings that are either irrational or out of proportion to any actual threat. Avoidance of the object, activity or situation that triggers the phobia, to avoid being ashamed or embarrassed.

How do you get triskaidekaphobia?

The origins of this fear are unknown but may be connected to the arrest of the Knights Templar on Friday, October 13, 1307. Many cultures have traditions of unlucky numbers other than 13. These beliefs, like our fear of 13, are typically rooted in ancient events that were somehow connected with the number in question.