Welcome to a tour of the ten most horrifying medical cases ever recorded – a chilling reminder of why we’re glad to live in the age of antibiotics, sanitation, and modern dentistry. These stories, each more grotesque than the last, show how medicine once resembled a horror show.
10 Exploding Teeth
Remember the last time you endured a bad toothache? Now imagine that agony multiplied a hundredfold, so intense you lose touch with reality and behave like a rabid animal while your dentist watches helplessly. That was the fate of a handful of patients in the 19th and early 20th centuries, whose infected teeth apparently cured themselves by exploding.
In 1817, Reverend DA of Springfield suffered a toothache so severe he acted like “an enraged animal,” banging his head against the ground and biting a fence post for relief. The pain only worsened. One morning his wife heard a gun‑shot‑like crack; moments later the reverend swaggered in, declaring himself cured. His tooth had detonated, hurling calcium fragments across the room.
Several similar cases exist. Although most patients felt better after the burst, the explosion could itself be damaging. In 1871 a woman was knocked off her feet by a blast so loud she briefly went deaf. Exploding teeth mysteriously vanished in the 1920s, likely because the metal alloys used in older fillings sometimes produced hydrogen gas, which could build up and cause a miniature explosion.
9 Gigantic And Painful Intestinal Worms
Tapeworms still plague people today, but they’re mere minnows compared with some monstrous parasites documented in the 18th century. In 1782, a medical journal reported a young man who passed a worm half a meter long (1.5 ft) and four centimeters thick (1.5 in). By “passed,” we mean he needed a friend to help yank the creature from his rear.
The worm resembled an earthworm with jointed segments, filled with dark, sticky blood, and sported a duck‑bill‑like jaw. Dark chocolate in color, it had burrowed inside his intestines for days, causing excruciating pain. Clearly, it wasn’t a typical tapeworm.
A similar 16th‑century account comes from Italian goldsmith Benvenuto Cellini, who wrote that he once vomited a 13‑centimeter (5‑inch) worm covered in long, dark hairs. No one could identify the creature.
8 Dancing Plagues
Mass hysteria occurs when groups act irrationally on a massive scale. Famous examples include the Loudun possessions and the Salem witch trials. Occasionally, hysteria intersected with medicine to create bizarre “plagues.” One of the creepiest was the dancing plague of 1518.
The outbreak began on a hot July day in Strasbourg when a woman started dancing in the street and couldn’t stop. Days later she was still dancing, apparently no longer in control of her body. Soon, at least 100 others joined, discovering they too could not cease the compulsion.
Eyewitnesses reported terrified victims begging to be stopped. Within days, people were literally dancing themselves to death. The town’s solution was bizarre but effective: set up halls and stages, hire musicians to play nonstop, and force the afflicted to dance until exhaustion. By September, the dancers—now numbering 400—were finally spent, and the plague ended.
This was the last dancing plague in Europe, but not the first. Records show at least ten earlier outbreaks, including a 1374 event that swept across present‑day Belgium, Luxembourg, and northern France.
7 Bladder Beetles
Few things are as unsettling as hearing a doctor announce “prostate cancer.” Even worse is discovering a living creature crawling out of the end of one’s penis. In 1838, a 23‑year‑old man with a urinary tract infection experienced exactly that.
After days of bleeding and pus‑filled urination, he became unable to pee. Doctors rushed to fetch a catheter, but before it arrived, the problem resolved itself in the most horrific way: a pea‑sized beetle burst from his penis, followed by a heavy discharge of pus and urine. Examination revealed the beetle was the blockage.
Terrifyingly, such cases were not isolated. Former BBC journalist Thomas Morris has chronicled many similar incidents on his blog, including a boy who expelled sixteen slugs from his urethra.
6 Sleepy Sickness
If you were whisked back to 1918, the Spanish flu would dominate your mind, but another, less lethal yet equally baffling disease lurked in the shadows: encephalitis lethargica, commonly called sleepy sickness. While the Spanish flu killed up to 50 million people—twice as many as World War I—sleepy sickness claimed about one million lives.
Scientists now believe the condition stemmed from a rare strain of Streptococcus bacteria. At the time, physicians observed people falling into a narcolepsy‑like sleep, with some never waking. Victims didn’t die outright; instead, many slipped into a coma‑like state, unable to control their bodies yet retaining brain activity.
Millions worldwide suffered this horrific fate. Some patients were “awakened” with drug treatments in 1969, but many relapsed into the sleepy state after only weeks. Although the disease has largely faded, occasional cases still appear, and a major resurgence appears unlikely.
5 Eye Spiders
The phrase “eye spiders” alone is enough to send shivers down many spines. In 1840, Dr. Lopez of Alabama was summoned to Charleston for a gruesome case. The night before, a patient felt something drop on her face while sleeping. By morning, she awoke with a severely swollen eye, and upon examination, a mucus‑coated spider was discovered living inside the cavity.
The horror didn’t stop there. Days later, Dr. Lopez returned to find more spiders in the same eye socket. Over the following weeks, he visited daily, extracting tiny, mucus‑covered spiders each time. Locals eventually believed the original spider had laid an egg sac behind the eyeball, causing the ongoing infestation.
Fortunately, Dr. Lopez soon realized the situation was implausible. The woman was later deemed mentally ill, likely inserting the spiders herself for attention. Still, the 19th century was fertile ground for extracting animals from bodies—stories abound of a boy who vomited millipedes and another who reportedly expelled a live mouse from his intestine.
4 Ice Age Superbugs
Antibiotic‑resistant superbugs are a modern nightmare, but research shows they may have ancient roots. Evidence suggests these Darwinian monsters spent millennia in what is now Canada, decimating Ice Age peoples long before humans invented antibiotics.
In 2011, Scientific American reported that antibiotic‑resistant bacteria were found deep within the ice outside Dawson City, Yukon. These microbes were at least 30,000 years old and had never seen sunlight. Thousands of years before humanity discovered antibiotics, Actinobacteria already possessed defense mechanisms to thwart them.
While these ancient superbugs didn’t change the fate of Ice Age humans—bugs killed them regardless—the finding hints that if you ever travel back via a DeLorean or TARDIS, you’d want to steer clear of prehistoric Canada.
3 Laughing Plagues
The dancing plague may belong to centuries past, but a more recent instance of mass hysteria occurred in 1962 Tanganyika (now Tanzania). That year, a laughing epidemic broke out, causing people to burst into uncontrollable laughter that persisted for months.
Victims laughed so intensely they injured themselves; schools were shut, villages quarantined, and when the epidemic finally faded, roughly 1,000 individuals had laughed themselves into illness. Those affected described a sensation of “things moving about in their heads,” as if an alien force controlled them.
Today, experts attribute the phenomenon to mass hysteria, but the sheer absurdity of a continent-wide giggle fit remains chilling.
2 Vomiting Up A Fetus
In 1835, French physician Dr. Ardoin, practicing in Greece, documented a shocking case: a young boy named Demetrius Stamatelli vomited a fetus. The gruesome detail deepens when you realize the expelled baby was likely his own parasitic twin.
Parasitic twins occur when one twin absorbs the other in utero. Usually the absorbed twin remains unnoticed until death, sometimes requiring surgical removal if complications arise. The 1830s Greek incident stands alone as the only recorded instance of someone apparently vomiting their twin.
Demetrius suffered severe abdominal pain, teetering on the brink of death. Only after a violent vomiting fit did his symptoms subside—the dead twin emerged from his mouth, apparently attached by an umbilical cord. Dr. Ardoin found the case both horrifying and fascinating.
1 The Plague Of Athens
Among all the gruesome and mysterious plagues that have plagued humanity, none rivals the Plague of Athens (430‑426 BC) for sheer horror and enigma. The cradle of democracy transformed into a theater of gore, with victims displaying red‑stained eyeballs, bloody tongues, decaying throats, and ulcerated skin.
According to the sole surviving eyewitness account by Thucydides, death typically followed a devastating bout of diarrhea. Up to two‑thirds of Athens’ population perished, including many of its greatest leaders and generals.
Modern scholars remain divided on the culprit. Some argue it was the earliest known Ebola outbreak, while others suggest cholera, bubonic plague, typhoid, or even measles. The mystery endures, cementing the Plague of Athens as one of history’s most terrifying medical enigmas.