Other medical journal articles have discussed additional aspects of this possible link between vasovagal syncope and evolutionary fitness in blood-injection-injury phobias. The loss of consciousness is sometimes accompanied by convulsions and numerous rapid changes in the levels of many different hormones. This is followed by a rapid plunge in both heart rate and blood pressure, sometimes leading to unconsciousness. First, there is a brief acceleration of heart rate and blood pressure. This type of needle phobia is uniquely characterized by a two-phase vasovagal response. The discussion of the evolutionary basis of needle phobia in Hamilton's review article concerns the vasovagal type of needle phobia, which is a sub-type of blood-injection-injury type phobia. Hamilton, author of the pioneering paper on needle phobia, it is likely that the form of needle phobia that is genetic has some basis in evolution, given that thousands of years ago humans who meticulously avoided stab wounds and other incidences of pierced flesh would have a greater chance of survival. ![]() Augusta University professor Amy Baxter attributes this increase to an increase in administration of booster shots around the age of 5, which is old enough to remember and young enough to be more likely to result in formation of a phobia. Prevalence of fear of needles has been increasing, with two studies showing an increase among children from 25% in 1995 to 65% in 2012 (for those born after 1999). The diagnosis criteria for BII phobias are stricter, with an estimated 3-4% prevalence in the general population, and this also includes blood-related phobias. It is estimated that at least 10% of American adults have a fear of needles, and it is likely that the actual number is larger, as the most severe cases are never documented due to the tendency of the sufferer to avoid all medical treatment. Phobic level responses to injections cause sufferers to avoid inoculations, blood tests, and in the more severe cases, all medical care. The condition was officially recognized in 1994 in the DSM-IV ( Diagnostic and Statistical Manual of Mental Disorders, 4th edition) as a specific phobia of blood-injection-injury type phobia (BII phobia). ![]()
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