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- Why this happens (and why it’s rarer than your brain is about to claim)
- 1) Abby Beckley, the Oregon woman who pulled worms from her eye
- 2) The Texas man whose “stress headaches” turned out to be a tapeworm problem
- 3) The Maryland traveler with a “flesh-eating” fly larvae infestation
- 4) The traveler who came home with botfly larvae “boils”
- 5) The ER patient whose scalp “bump” wasn’t just a bump
- 6) The 2-year-old boy with a leech in his throat
- 7) The 7-year-old girl treated for a sore throat… until the truth wriggled out
- 8) The immigrant patient with a worm under the eye’s surface
- 9) The woman in the U.S. whose bile duct got a roundworm “guest”
- 10) The sushi eater who learned what “fresh catch” can really mean
- How to lower your odds of becoming a wildlife documentary
- Conclusion: your body is not supposed to feel “occupied”
- Extra: What these experiences can feel like (about )
Your body is an incredible machine. It digests pizza, heals paper cuts, and somehow keeps your heart beating while you’re asleep.
Unfortunately, it can also become a surprise Airbnb for creatures that did not pay a cleaning fee.
“Things living inside someone” sounds like a horror-movie tagline, but real medicine has plenty of documented casesoften tied to travel,
contaminated food or water, insect bites, or just plain bad luck.
This article walks through ten real-world medical cases where something moved inworms, larvae, and leechesand what happened next.
We’ll keep it accurate, human, and (as much as possible) funny, because if you’re going to learn about internal hitchhikers,
you deserve at least a few laughs along the way.
Why this happens (and why it’s rarer than your brain is about to claim)
Most “living inside you” situations boil down to a simple theme: a parasite’s life cycle accidentally intersects with a human’s life choices.
Parasites aren’t “evil.” They’re just wildly committed to survival, and the human body is warm, wet, and full of nutrientsbasically a five-star resort.
The good news: in many cases, humans aren’t even the parasite’s preferred host, so the invader can’t thrive long-term once it’s discovered and treated.
The better news: prevention is boring in the most comforting waywash produce, cook meat properly, avoid swallowing questionable water, use insect repellent,
and don’t treat “raw snail” as a personality trait.
1) Abby Beckley, the Oregon woman who pulled worms from her eye
Abby Beckley (Oregon) noticed eye irritation that wouldn’t quitlike a gritty eyelash that had declared squatters’ rights. Then came the moment nobody wants:
she removed what looked like a clear thread… and realized it was a live worm. Over a short span, multiple tiny worms were taken from her eye.
What was living inside her?
A cattle eyeworm species, Thelazia gulosa, not previously known for infecting humans. It typically spreads via flies that feed around animals’ eyes.
Humans are usually too good at swatting flies away, which is apparently our greatest evolutionary flex.
How doctors solved it
The fix was refreshingly low-tech: careful removal and eye care. The big win here wasn’t a dramatic “miracle drug,” but rapid recognition and steady extraction.
(A sentence that is fine in medicine and terrifying in every other context.)
2) The Texas man whose “stress headaches” turned out to be a tapeworm problem
A man in Texas developed intense headaches that escalated into vomiting. The story reads like a cautionary tale about ignoring symptoms… until imaging suggested
something far more serious than tension: a parasitic infection affecting the brain.
What was living inside him?
Neurocysticercosiscysts formed by the larval stage of the pork tapeworm (Taenia solium). Importantly, this usually happens from swallowing tapeworm eggs
(often via fecal-oral contamination), not simply from eating pork.
How doctors solved it
Treatment depends on where the cysts are, how many, and what stage they’re in. Management commonly includes anti-parasitic medication, steroids to control inflammation,
and seizure control when needed. In certain situations, surgery may be part of care. Translation: it’s treatable, but it’s not a “sleep it off” situation.
3) The Maryland traveler with a “flesh-eating” fly larvae infestation
In 2025, U.S. health officials confirmed a travel-associated case of New World screwworm in a patient who had recently traveled to Central America.
Screwworm isn’t a “worm” in the classic sense; it’s fly larvae (maggots) that can invade living tissue.
What was living inside them?
Larvae of Cochliomyia hominivorax (New World screwworm). Female flies lay eggs in or near open wounds; larvae hatch and feed on living tissue.
It’s rare in the U.S., and officials emphasized the overall public health risk was very low.
How doctors solved it
Prompt identification and removal of larvae is critical. The bigger response is public-health focusedsurveillance, prevention, and livestock protection
because this parasite is a major problem for animals and can become an economic disaster if it spreads.
4) The traveler who came home with botfly larvae “boils”
A returning traveler developed painful, boil-like skin nodules with a tiny central opening. The lesion would drain. It itched. It felt “alive,” which is a phrase
you should never have to say about your own skin.
What was living inside them?
Human botfly larvae (Dermatobia hominis)a cause of furuncular myiasis. Travelers can pick it up in regions where the botfly is found; larvae develop under the skin.
How doctors solved it
The goal is complete larval removal without leaving parts behind, which can inflame the tissue. Depending on the case, clinicians may use local procedures
or surgical extraction. The good news: once removed, most people heal well.
5) The ER patient whose scalp “bump” wasn’t just a bump
Another botfly-style case: a patient presented with a persistent, tender lesion after travel. What looked like a stubborn cyst ended up being a larva living under the skin.
If you’ve ever named a zit out of spite, imagine what you’d name this.
What was living inside them?
A fly larva causing cutaneous myiasismedically real, visually upsetting, and a great reminder that travel souvenirs should be magnets and snacks, not parasites.
How doctors solved it
Surgical removal and follow-up care. The key clinical lesson: when a “boil” has a central pore, drainage, and a travel history, think myiasis early to avoid
weeks of ineffective antibiotics.
6) The 2-year-old boy with a leech in his throat
A toddler presented with significant anemia and symptoms that didn’t immediately scream “leech.” That’s partly because leeches can hide in the oropharynx,
attach to mucosa, and quietly feedreleasing anticoagulants that keep blood flowing.
What was living inside him?
A leech lodged in the throat area. It’s rare, but it can happen after exposure to freshwater sources where leeches liveespecially if water is swallowed
during swimming or drinking.
How doctors solved it
Removal of the leech and treatment of the anemia. This is one of those cases where the “foreign body” isn’t a coin or a toyit’s… enthusiastic biology.
7) The 7-year-old girl treated for a sore throat… until the truth wriggled out
A child had throat symptoms that were initially managed as an infection. But the real culprit wasn’t bacteriait was a leech attached in the pharynx,
which can mimic routine illness until someone looks carefully (or until the problem dramatically reveals itself).
What was living inside her?
A leech in the pharynx. Aside from bleeding and discomfort, leeches can cause a “something stuck” sensation, coughing, and persistent irritation.
How doctors solved it
Once identified, removal is the priority. The bigger takeaway is diagnostic: persistent throat symptoms plus bleeding and freshwater exposure should trigger
a “let’s actually look” moment.
8) The immigrant patient with a worm under the eye’s surface
Some parasites don’t go for subtle. A patient presented with eye pain and swelling and reported a previous sensation of a worm moving in the eye.
Examination found a worm-like object under the conjunctiva, which was surgically removed.
What was living inside him?
A parasitic worm beneath the conjunctiva. In real-world cases like this, certain filarial worms can migrate through tissues and occasionally show up in the eye.
It’s uncommon, but when it happens, it’s memorable for everyone involvedincluding the worm.
How doctors solved it
Surgical removal plus diagnostic work-up to identify the species and determine whether additional treatment is needed (because “one worm” can sometimes imply a larger infection).
9) The woman in the U.S. whose bile duct got a roundworm “guest”
A woman (an immigrant living in the United States) developed symptoms that led to endoscopic evaluation of the biliary system. During ERCP, clinicians found
an Ascaris lumbricoides worm in the bile duct areaan anatomical location that is not supposed to contain anything with ambitions.
What was living inside her?
Ascaris lumbricoides, a large intestinal roundworm that can migrate into the biliary tree and cause pain, obstruction, or pancreatitis-like symptoms.
How doctors solved it
Endoscopic removal during ERCP, followed by anti-parasitic treatment and evaluation for reinfection risk. Medicine gets very practical when a worm blocks plumbing.
10) The sushi eater who learned what “fresh catch” can really mean
A man developed abrupt upper abdominal pain hours after eating raw fish at a sushi restaurant. Endoscopy revealed the culprit: a larva embedded in the stomach lining.
If you’ve ever said “I could eat sushi every day,” this is your reminder to also say “from reputable places.”
What was living inside him?
Anisakis larvaoften called a “herring worm” or “sushi worm.” Humans aren’t the intended final host, but the larva can still burrow into the GI tract and cause
severe pain, nausea, and occasionally allergic-type reactions.
How doctors solved it
Endoscopic removal is the star of the show when the larva is visible. Prevention is equally clear: proper freezing or cooking of fish kills the larvae.
(The fish doesn’t have to suffer. It’s already fish.)
How to lower your odds of becoming a wildlife documentary
- Cook meat thoroughly and follow safe food-handling rules. “A little pink” is for sunsets, not pork.
- Choose reputable sushi sources and don’t DIY raw seafood unless you understand proper parasite-killing preparation.
- Wash produce aggressivelyespecially if you’re in areas where snails/slugs can contaminate greens.
- Avoid swallowing freshwater in places where parasites and leeches are present.
- Use insect repellent and protect wounds while traveling.
- Take persistent symptoms seriously: unexplained eye irritation, chronic “boils” after travel, unusual bleeding, severe headaches, or neurologic symptoms deserve medical attention.
Conclusion: your body is not supposed to feel “occupied”
The most unsettling part of these stories isn’t just the idea of parasitesit’s how ordinary many beginnings are: a trip, a meal, a swim, a small wound, a weird itch.
The through-line is also reassuring: diagnosis plus proper removal/treatment typically leads to recovery, and prevention is mostly common-sense hygiene and safe food practices.
If anything in you feels like it’s moving, migrating, or staging a tiny revolt, don’t negotiate. Get checked.
Extra: What these experiences can feel like (about )
People who go through these infestations often describe the emotional whiplash first: disbelief, then embarrassment, then a sudden deep respect for soap.
Eye-related cases tend to start with mild irritationsomething you’d blame on wind, allergies, or a contact lens that’s having an attitude. The fear spikes when symptoms
don’t behave like normal irritation: a persistent foreign-body sensation, watering, redness, and that unmistakable moment of realizing the “thread” you’re pulling
is not a thread. Patients often report a mix of panic and grim fascinationbecause your brain is screaming “NO,” while another part is thinking, “Is this really happening?”
Skin larvae cases frequently come with a different kind of stress: the slow burn. A bump appears. It becomes tender. It drains. It itches. Antibiotics don’t help.
Then the sensation changessome people report intermittent sharp pain or a strange awareness that the lesion isn’t static. The anxiety is amplified by uncertainty:
friends say it’s “just a boil,” but the body keeps sending a louder message. When clinicians finally identify myiasis, patients often feel relief and horror in equal measure.
Relief because there’s an explanation; horror because the explanation has mouthparts.
Throat and airway “stowaway” cases can be terrifying fast. A leech attached to mucosa may cause repeated bleeding or anemia that seems disproportionate to the visible problem.
Parents often describe confusionhow can a kid be so tired from “just a nosebleed” or “just a sore throat”? Kids, meanwhile, may struggle to explain the sensation:
it’s not a classic sore throat; it’s more like “something’s there.” Once the leech is removed, families often describe an immediate shift in symptomsless bleeding, easier breathing,
improved energyfollowed by a delayed emotional reaction when they fully process what happened.
Brain-involving infections are a different category altogether. People can feel betrayed by their own bodies: headaches that escalate, nausea, episodes that look like seizures,
confusion, or memory issues. The hardest part is often the diagnostic periodappointments, tests, scans, and the creeping realization that something significant is wrong.
When clinicians identify a parasitic cause, patients may feel stigma, even though many infections are linked to sanitation exposure or travel and not “being dirty.”
Recovery frequently includes not just medication, but reassurancehelping the patient understand what happened, how it spread, and how to reduce risk going forward.
Across all these cases, the common experience is this: once you’ve lived through a “something was living inside me” story, you become the most passionate person
at the dinner table about washing produce, cooking food properly, and getting weird symptoms checked early. You may also develop a lifelong habit of saying,
“Nope,” with confidenceand honestly, that’s personal growth.
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