Fear of Blood
Haemophobia
Haemophobia is a fear of blood, and it is grouped with two other fears for a reason that has nothing to do with what they are about. Blood, needles and injury share a physical response: vasovagal syncope, an actual faint, which is uncommon in phobias generally. DSM-IV therefore folded them into blood-injection-injury phobia, and some earlier texts named the same category blood-injury-illness phobia.
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How the spelling splits by country
This is the term where British and American English come apart most visibly. Hemophobia and hematophobia are the American forms; haemophobia and haematophobia are the British. Four spellings, one fear, and the split is orthographic rather than conceptual, which is a rarer situation in this catalogue than the reverse.
What happens instead of panic
The material describes the physical symptoms of any panic response:
- rapid heart rate
- breathlessness and chest tightness
- trembling
- sweating, with hot and cold flushes
- vomiting
It also names lightheadedness, and lightheadedness in this fear is not a metaphor for distress. It is the beginning of a faint.
Control of the response is attributed to the vagus nerve, which governs activity in the chest and abdomen, and this is the mechanism the whole category is named around.
Where the fear is argued to come from
The material carries two arguments and does not resolve them, which is worth preserving rather than smoothing over.
Kendler, Neale, Kessler, Heath and Eaves argued in 1992, comparing identical and non-identical twins, that a genetic factor common to every phobia predisposes strongly toward specific phobias, with elevated trait anxiety as the inherited background and conditioning supplying the particular trigger. A different twin study cited in the same article concludes the opposite: social learning and traumatic events matter more than genetics for this fear.
Investigators typically classify around sixty per cent of self-reported onsets as conditioning experiences, and the article is unusually willing to doubt its own number. Thyer and colleagues in 1985 counted as a conditioning episode a patient who received an injection at thirteen and fainted, and another who at six heard a school talk on the circulatory system and was frightened to the point of syncope. Both cases feature a faint. Whether the faint was caused by the event or revealed by it is exactly the question the classification does not answer.
Why the figure belongs to the category
Blood-injection-injury phobia affects about four per cent of the population in the United States. That figure is for the whole category, not for blood alone, and no separate estimate for haemophobia appears in the material. The category exists because the three fears behave alike; the cost of that decision is that the individual terms have no numbers of their own.
Why applied tension runs the other way
Applied tension has increasingly gained favour: tensing the muscles deliberately in order to raise blood pressure, used where the fear is accompanied by falling blood pressure and fainting. Standard approaches, cognitive behavioural therapy and desensitisation, are described as applying here as they do elsewhere.
What is worth noticing is that applied tension was derived from the mechanism rather than from a theory of fear. Almost nothing else in this catalogue has that property.
Told apart
Often confused with Fear of Blood
- Fear of Blood, Injections and InjuryBlood phobia is one of the three fears the category was built from, so a figure quoted for haemophobia is almost always the figure for the whole group. Only the category has been measured.
- Fear of NeedlesTrypanophobia produces the same biphasic faint and sits in the same category. What separates them in practice is that a needle can be avoided by declining a procedure and blood cannot.
Common questions
Questions about Haemophobia
- Why is fainting so common in this fear?
- Because the response is vasovagal rather than simply anxious. Control is attributed to the vagus nerve, which governs activity in the chest and abdomen, and the result is a fall in blood pressure severe enough to produce a faint. Vasovagal syncope is uncommon in other phobias and is the reason blood, injections and injury were classified together.
- Is it spelled haemophobia or hemophobia?
- Both, depending on the country. Haemophobia and haematophobia are the British forms and hemophobia and hematophobia the American. It is one of the few terms in this catalogue where the variant spellings reflect nothing but national convention.
- Is the fear inherited?
- The sources disagree in the same article. Kendler and colleagues argued in 1992 from twin comparisons that a genetic factor common to all phobias predisposes strongly toward specific ones. Another twin study cited alongside it found social learning and traumatic events more significant than genetics for this fear specifically.
- How reliable is the claim that most cases start with an incident?
- Around sixty per cent of self-reported onsets are classified as conditioning experiences, and the article doubts its own figure. The examples given by Thyer and colleagues in 1985 both involve fainting: an injection at thirteen, and a school talk on the circulatory system at six. In each case the reaction may have been revealed rather than created.
- Why does the treatment involve tensing rather than relaxing?
- Applied tension raises blood pressure deliberately, and it is used because blood pressure in this fear is falling rather than rising. It is one of very few interventions in this subject derived from a physical mechanism rather than from a theory about fear.
Added 2026-08-23 · Revised 2026-08-26
Nearby in the catalogue
Related entries
- Fear of Blood, Injections and InjuryThe only phobia whose physiology runs backwards, and the only one with a treatment derived from it. Relaxation is the wrong advice; applied tension is the right one.
- Fear of NeedlesRecognised by DSM-IV in 1994, and the one phobia type whose blood pressure falls instead of rising. Its four subtype shares add up to 110 per cent.
- Fear of ColorsClinical fears of colour are rare and usually attach to one hue. The same word names an old argument that Western taste has always distrusted colour.
- Fear of the Colour PurpleThe literature grants it a single definition. The wider colour-fear vocabulary is described as existing mostly in lists of exotic words.
- Fear of Being ScratchedThe reference entry names its own exception: for someone with a severe allergy to scratches, hair or fleas, it calls the fear quite appropriate rather than excessive.
- Fear of DoctorsThe only fear whose avoidance behaviour damages health directly. Its prevalence has never been reported, and the figure quoted instead measures something else.