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Jan 17, 2020 · But today, the medical leech no longer hails from the pond. If you live in the United States and are given a leech, it’s likely that it came from a laboratory in Wales.
- Bradley Allf
- Overview
- Good medicine
- Supply chain
- Leech mania
European medicinal leeches were famous for their popular purpose: treatment for everything from cancer to mental illness. But the high demand left them endangered—still today.
Bloodletting methods
Leeches were an early method for bloodletting, as shown in this 15-century illustration from Giovanni Boccaccio’s Decameron, but the species became scarce, and more methods evolved.
When people think of market crazes, Dutch tulips or real estate come to mind. But in the 19th century demand for Hirudo medicinalis—the European medicinal leech—nearly drove the species to extinction. Its medicinal properties were touted as a cure-all across Europe, and the animal was used to treat everything from cancer to tuberculosis to mental illness.
The coveted worm—dark brown or black in color, with a thin stripe of yellow, green, or red along its back—was popular because it supposedly had a gentle touch, yet also, importantly, a voracious appetite.
Physicians of the period often prescribed dozens of leeches to treat what ailed a patient. Someone with suspected pneumonia, for example, might have up to 80 leeches each treatment session applied across the chest. For gastritis therapy, as many as 20 to 40 leeches could be prescribed. As a result, wild Hirudo medicinalis became increasingly scarce across its range in Europe.
Victorian-era Europeans weren’t the first to look to these bloodsucking worms for succor. Leeches were used medicinally by ancient Egyptians, and later in India, Greece, and Rome. Greek physicians typically used the animals for bloodletting, to balance the humors, and also for conditions as varied as gout, fever, and hearing loss.
Leech use reached new heights in the 19th century largely because of the influence of François-Joseph-Victor Broussais, the head doctor of Val-de-Grâce in Paris. The physician declared that all ills, ranging from smallpox to cancer, were the result of inflammation, and bleeding, he said, was the cure. Bloodletting via leech became de rigueur because it was relatively safe and didn’t require any specialized skills. And leeches have natural anticoagulants in their saliva, which helps stop bleeding once they drop off a patient.
Broussais treated his own indigestion by applying dozens of leeches, and he believed leeching could have salubrious effects on animals, too: He bled his fighting cocks weekly, though the weakened birds performed poorly. Such was the demand for leeches that from 1830 to 1836 Broussais’s hospital alone used over two million of them, sometimes applying large numbers of leeches to new patients prior to any diagnosis. Other French hospitals recorded robust use during the years of peak leech popularity, too: From 1820 to 1850, some used between 5,000 and 60,000 leeches annually, according to work by Roy Sawyer, the founder of the Medical Leech Museum, in Charleston, South Carolina.
(Parasites like leeches may gross us out, but they hold ecosystems together.)
To meet demand, hospitals relied on rural workers who gathered the wild animals. Leech gatherer, unsurprisingly, was a distinctly unenviable job in the 19th century, but the work was reliable. Wading into a freshwater pond or muddy ditch to offer up his—or often her—body as bait to parasitic worms, a leech gatherer’s job was described as “employment hazardous and wearisome” by poet William Wordsworth.
Leeches were found in freshwater ponds, streams, wetlands, and ditches throughout Europe. They would sup upon the blood of many creatures: deer, horses, cattle, and humans, as well as fish, amphibians, and waterbirds.
During the Victorian era, enthusiasm for leeches spread widely across Europe and also gave rise to a leech trend glorified in European fashion and art. Leeches were embroidered on women’s dresses. Apothecaries purchased elaborate, two-foot-tall ceramic containers to prominently display and house their leeches. The need to transport leeches across vast distances for transcontinental and, eventually, transatlantic journeys also inspired innovations in leech storage.
To help meet a burgeoning American demand, in 1835 a $500 award—roughly $17,000 in modern-day dollars—was advertised for anyone who could breed European medicinal leeches in the United States, but that venture never proved successful.
(Leeches are still used in medicine—yes, really. Here’s why.)
The relationships between people and their parasites also gave rise to surprising long-term bonds: British Lord Chancellor Thomas Erskine, who lived from 1750 to 1823, was so grateful to two leeches that bled him when he was extremely sick that he kept the pair as companions. Storing them in a glass, he gave them fresh water daily and named them Home and Cline after two celebrated surgeons, according to Leech by University of Manchester medical historians Robert Kirk and Neil Pemberton.
Despite the popularity of the European medicinal leech, it was not an ideal product for commercialization. The species only needed a blood meal every six months and didn’t reach reproductive age for a couple years. Used leeches were often disposed of in ditches or ponds, where they could theoretically reproduce, but species overexploitation alongside draining and redevelopment of marshlands for agriculture—and the likely related losses of amphibians that the leeches relied on as food staples—fueled declines.
To help save the medicinal leech from extinction, a small number of 19th-century European governments implemented some of the first ever wildlife protections, either prohibiting leech exports or regulating leech collecting. In 1848 Russia banned taking them from May to July, the prime breeding season.
- Dina Fine Maron
Feb 18, 2019 · Doctors placed leeches everywhere on a patient ranging from the anus to the mucous membranes. In the United States physician Benjamin Rush, who also happened to be one of the United States’ Founding Fathers, was a proponent of the practice.
Mar 24, 2020 · By the end of the 18th century medicinal leeches were nearly extinct in many countries, including Ireland, England, Wales, and the Netherlands. In response countries began farming leeches and importing wild ones from places as far away as Russia, Hungary, and the Ottoman Empire.
Nov 27, 2017 · When supplies dwindled in 1835, a $500 prize was offered to anyone who could breed the preferred European leech in the United States.
- Natasha Frost
Nov 11, 2016 · Leeches became widely used in the United States, and in 2004 the FDA approved leeches as a “medical device,” enabling new leech-farming companies from other countries to enter the market.
People also ask
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Did leeches help cholera?
May 19, 2023 · According to this theory, an imbalance in the four bodily fluids — blood, yellow bile, black bile, and phlegm — could lead to different illnesses, and were connected to seasons, body parts and stages of life.
