Fear of Sharp Objects
Aichmophobia
Aichmophobia is a morbid fear of sharp or pointed objects, and its main practical use in the literature is as the wider category that needle phobia keeps being confused with. A third condition sits beside them both and is not a fear at all.
Which terms get confused here
Aichmophobia is the general term: an intense fear of anything sharp or pointed, and the examples given in the reference sources run wide:
- knives and scissors
- needles and nails
- broken glass
- pencils
Trypanophobia is narrower and specifically medical, a fear of injections and hypodermic needles. Wikipedia notes that the general term is often used where the specific one is meant, and the Cleveland Clinic's page separates them explicitly, which suggests the confusion is common enough to be worth a heading.
The distinction is not cosmetic. A fear of needles in a medical setting belongs to the blood, injection and injury cluster, where the characteristic response is a drop in blood pressure and a faint, and where standard exposure has to be modified. A fear of kitchen knives does not, and responds to ordinary exposure therapy.
The third condition is visual looming syndrome, which Wikipedia flags as not to be confused with this one. There the person does not fear sharp objects. They feel pain or discomfort on looking at a sharp object nearby. The behaviour looks identical from outside and the mechanism is not the same.
Where the word appears in print
Wiktionary's earliest citation is from Robert Heinlein's novel Glory Road in 1963, which uses it as a piece of borrowed jargon: some people cannot stand knives, swords, bayonets, anything sharp, and psychiatrists have a word for it. Heinlein adds the observation that the same people will drive at a hundred miles an hour on a fifty-mile road and still panic at a bare blade, which is a clean statement of what disproportion means.
George Kisker's 1977 textbook on the disorganised personality gives the fullest early description: broken glass, scraps of metal, nails and scissors, and eccentric habits following from the avoidance. Alan Hollinghurst's 2004 novel uses it precisely, for a character who cannot carve a joint of venison.
What is known and what is estimated
Nobody has counted it. The Cleveland Clinic says outright that researchers do not know the number of cases, and offers instead the figure for specific phobias as a class, approximately 7 to 10 per cent of the population. It adds that specific phobias arise more often in adolescents and young adults and more often in women, which is a statement about the category rather than about this fear.
On causes it names two possibilities and commits to neither: experiencing or witnessing an accident involving a sharp object, and the fear being a form of obsessive-compulsive disorder. The second is the more interesting suggestion, because an intrusive thought about a knife and a fear of a knife are different things that produce the same avoidance.
Why the qualifier morbid matters
Merriam-Webster's usage example makes a point the clinical pages do not. There is probably a touch of aichmophobia in all of us, it says, and most people simply tough it out or look away during an injection. That is the ordinary end of the distribution, and it is the reason the term needs the qualifier morbid to mean anything.
Told apart
Often confused with Fear of Sharp Objects
- Fear of NeedlesWikipedia and the Cleveland Clinic both record that the general term is used where trypanophobia is meant. The needle fear sits in the blood-injection-injury cluster and can end in a faint, which changes how exposure has to be run.
- Fear of InjuryA knife is feared for the wound it could make, so the two overlap wherever the object is being feared for its consequence rather than its shape.
- Fear of Being ScratchedAmychophobia takes the same injury from a claw. Both attach to what a point can do rather than to what it belongs to.
Common questions
Questions about Aichmophobia
- Is it the same as a fear of needles?
- No, and the sources say so. Aichmophobia covers anything sharp, from scissors to pencils. Trypanophobia is specifically about injections and hypodermic needles in a medical setting. The general word is often used for the specific one, and the substitution matters because needle phobia sits in the subtype where people faint.
- What is visual looming syndrome?
- A separate condition that Wikipedia flags because it is mistaken for this one. The person does not fear sharp objects; they experience pain or discomfort when looking at one nearby. The avoidance behaviour looks the same and the mechanism is not.
- Has anyone counted the cases?
- No. The Cleveland Clinic states that researchers do not know the number, and gives the class figure instead: 7 to 10 per cent of the population has some specific phobia.
- Could it be a form of OCD?
- The Cleveland Clinic raises the possibility without settling it. The reason it is worth raising is that an intrusive thought about a knife and a fear of a knife produce identical avoidance from the outside, and they are treated differently.
Added 2026-08-23 · Revised 2026-08-26
Nearby in the catalogue
Related entries
- 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 InjuryMerriam-Webster ties the word to combat. Wikipedia files it with blood and injections. One definition describes a veteran and the other a patient avoiding a procedure.
- 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 CookingNot cooking means living on pre-prepared food and takeaway, and that diet is associated with hypertension, obesity and diabetes down the line.
- Fear of GunsCoined by a firearms writer in the 1960s, and Wikipedia files it beside gun nut under terms applied to opponents. Both sides of the argument own guns.
- Fear of BooksThe clergy and the beadles held the legal and religious documents, and used them on people who could not read. Bibliomania is a hundred years older.