Trypanophobia is defined as extreme fear of medical procedures involving injections or needles. Although sometimes also referred to as aichmophobia, belonephobia, or enetophobia, these terms generally denote a fear of pins, needles, or sharp objects while trypanophobia also includes the medical aspect of the fear.
As much as 10 percent of people suffer from a phobia called trypanophobia, which is a fear of needles and injections. Of those who have a fear of needles, at least 20 percent avoid medical treatment as a result. The fear of needles is both a learned and an inherited condition.
Cases of needle phobia that are a sub-type of blood-injury-injection phobia are recognized by medical scientists who have studied this issue as being intrinsically different from other phobias in very important and fundamental ways.
It is not unusual for those with the blood-injury-injection phobia to experience either fainting or near-fainting when merely discussing needle procedures, or when listening to a discussion of needle procedures, or while watching someone else (even a pet) undergo a needle procedure.