Previous Trauma Involving Needles
Trypanophobia is often caused by previous trauma involving needles, though the nature of this trauma varies. In some individuals, if they have had the classic reaction of a sudden change in blood pressure, the fear of needles is a fear of what is described as a creepy, disoriented feeling. They are not so much afraid of the needles as afraid of how their bodies respond to needle sticks. For others, a fear of needles stems from childhood memories of needles thicker and duller than modern needles. These types of needles were by nature much more painful, especially for children. Even though the adult may tell themselves current needles are far less painful, there is still a part of them that remembers the childhood events and responds with fear.
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