By TrivBits, History Desk — Published November 7, 2026

Table of Contents

• Key Takeaways
• Understanding Medieval Medical Theory and Its Bizarre Medieval Remedies
• The Role of Historical Context in Medical Practice
• 9 Bizarre Medieval Remedies Doctors Actually Prescribed
• Why These Treatments Persisted for Centuries
• Frequently Asked Questions
• The Strange Legacy of Medieval Medicine
• Sources

Medieval medicine sounds like something out of a horror film. When you fell ill during this era spanning roughly the 5th to 15th century, you might find yourself prescribed crushed earthworms, bird droppings, or even a freshly killed chicken strapped to your body. These bizarre medieval remedies weren’t the work of charlatans—they were standard medical practice recommended by trained physicians across European civilizations and beyond.

The historical record reveals that doctors of the past operated with a completely different understanding of disease and healing. Without microscopes or knowledge of bacteria, medieval practitioners relied on ancient theories inherited from Greek and Roman civilizations, mixed with folk traditions and desperate experimentation. What resulted was a fascinating—and often stomach-turning—collection of treatments that somehow persisted for centuries.

Key Takeaways

• Medieval doctors based treatments on humoral theory, believing illness stemmed from imbalances in bodily fluids
• Animal parts, excrement, and toxic substances were commonly prescribed across all social classes in this historical period
• Many remedies reflected ancient medical knowledge passed down from Greek, Roman, and Islamic civilizations
• Physicians genuinely believed these bizarre treatments worked, creating detailed instructions for their preparation
• Some medieval remedies accidentally contained effective ingredients, though success was usually coincidental
• The empire of medical knowledge grew through trial and error, with physicians recording both successes and failures

Understanding Medieval Medical Theory and Its Bizarre Medieval Remedies

To understand why physicians prescribed such strange treatments, you need to grasp the medical worldview of the era. Medieval doctors inherited humoral theory from the ancient Greek physician Galen, who built upon Hippocratic traditions. This system dominated Western medicine for over a millennium.

According to this theory, health depended on balancing four bodily humors: blood, phlegm, yellow bile, and black bile. Each humor corresponded to specific qualities—hot, cold, wet, or dry. Disease occurred when these fluids fell out of balance. Treatments aimed to restore equilibrium, often through extreme measures that seem absurd today but followed internal logic within their theoretical framework.

Physicians also believed in the doctrine of signatures—the idea that plants and substances resembling body parts could treat ailments in those areas. A walnut, which looks like a brain, might cure headaches. Yellow flowers could treat jaundice. This thinking led to some truly creative, if misguided, medical applications that persisted throughout the medieval period and into the Renaissance.

The Role of Historical Context in Medical Practice

Medieval medicine wasn’t practiced in a vacuum. It represented a synthesis of knowledge from multiple civilizations. Islamic scholars preserved and expanded upon Greek and Roman medical texts during Europe’s early medieval centuries, eventually reintroducing this knowledge to Western Europe through translations. Medical schools in Salerno, Bologna, and Paris taught from these ancient authorities, treating their words as gospel.

The Catholic Church influenced medical practice significantly. Religious beliefs about sin, suffering, and divine punishment shaped how people understood disease. Pilgrimages to holy sites and prayers to patron saints existed alongside physical remedies. Yet contrary to popular belief, the Church didn’t universally oppose medical treatment—many monasteries served as centers of healing and herbal knowledge.

9 Bizarre Medieval Remedies Doctors Actually Prescribed

1. Urine as a Diagnostic Tool and Medicine

Medieval physicians didn’t just examine urine—they tasted it, studied its color against elaborate charts, and prescribed it as medicine. Doctors would inspect a patient’s urine in special glass flasks, looking for cloudiness, sediment, and hue to diagnose everything from lovesickness to plague. They also recommended drinking one’s own urine or applying it topically to wounds. Some physicians suggested aged urine for treating infections, believing the ammonia content (though they didn’t understand it chemically) had cleansing properties. This practice had roots in ancient Roman medicine and persisted well beyond the medieval era.

2. Trepanation for Headaches and Mental Illness

Drilling holes in skulls ranks among the most dramatic medieval treatments. Trepanation involved boring or scraping a circular hole through the skull bone, supposedly to release evil spirits, demons, or excess pressure causing headaches, epilepsy, or mental disturbances. Archaeological evidence shows people sometimes survived this procedure—skulls display healing around the edges of holes, proving patients lived long enough for bone regrowth. The practice dated back to prehistoric times and continued through the medieval period, performed with specialized tools by barber-surgeons who handled most surgical procedures.

3. Live Animals Applied to Wounds

When treating open sores or infections, medieval doctors sometimes prescribed applying live creatures directly to the affected area. A freshly killed chicken, pigeon, or puppy might be split open and placed warm against a wound or snakebite, supposedly drawing out poison. Live leeches served a similar purpose, though their use had some medical validity—they prevent blood clotting and contain mild anesthetics. Other treatments involved placing live frogs on abscesses or using puppy fat as an ointment. These remedies reflected beliefs about transferring disease from human to animal.

4. Excrement from Multiple Species

Dung therapy featured prominently in medieval pharmacology. Physicians prescribed animal droppings—from pigeons, dogs, chickens, and other creatures—for conditions ranging from baldness to bleeding. Crocodile dung mixed with honey supposedly worked as a contraceptive. Bird droppings treated eye infections. Human excrement even appeared in some remedy books, though less commonly. These treatments occasionally worked by accident: some animal waste contains bacteria that produce antibiotics, and the ammonia in aged feces has antiseptic properties, though medieval doctors had no knowledge of these mechanisms.

5. Mercury for Skin Diseases and Syphilis

Medieval and Renaissance physicians treated various skin conditions with mercury compounds, despite their extreme toxicity. Patients would be rubbed with mercury ointments, inhale mercury vapors, or even ingest small amounts. This treatment became especially popular for syphilis after the disease appeared in Europe around 1495. The saying “a night with Venus, a lifetime with Mercury” referred to this dangerous cure. Mercury did sometimes reduce visible symptoms temporarily, but caused severe side effects including tooth loss, tremors, kidney damage, and death. The treatment often proved worse than the disease.

6. Crushed Insects and Earthworms

The medieval pharmacopeia included numerous creepy-crawlies ground into powders or pastes. Earthworms were crushed and applied to wounds or boiled into broths for various ailments. Spiders were swallowed whole, wrapped in butter or bread, to cure fevers. Crushed beetles mixed into ointments treated skin conditions. Physicians believed these creatures possessed special properties that could transfer to patients. Some recipes required specific preparation methods—earthworms collected at dawn, spiders caught during certain moon phases—adding ritualistic elements to medical practice.

7. Bloodletting for Nearly Everything

Perhaps no medieval remedy was more universal than bloodletting. Physicians believed removing blood restored humoral balance and treated conditions from fever to plague to depression. They used various methods: cutting veins with lancets, applying leeches, or using heated cups to draw blood to the skin surface. Elaborate charts showed which veins to bleed for specific ailments and which astrological signs favored the procedure. While small amounts of bloodletting rarely caused serious harm, excessive bleeding weakened patients when they most needed strength, likely contributing to countless deaths throughout the medieval centuries.

8. Theriac: A Cure-All Containing Dozens of Ingredients

Theriac was the ultimate medieval wonder drug—a complex mixture containing dozens or even hundreds of ingredients, including viper flesh, opium, herbs, spices, and honey. Originally developed in ancient Rome as an antidote to poison, it evolved into a supposed cure for virtually any ailment. Preparing theriac was an elaborate public ceremony in some cities, with apothecaries mixing ingredients according to jealously guarded recipes. The most expensive versions contained crushed gemstones and gold. While theriac probably did little beyond the opium’s pain-relieving effects, it remained popular for centuries, demonstrating the power of placebo and social belief in medicine.

9. Cauterization with Hot Irons

Medieval surgeons routinely pressed red-hot irons against wounds, amputations, and various body parts to treat disease. This agonizing procedure supposedly stopped bleeding, prevented infection, and cured conditions from hemorrhoids to hernias. Physicians heated metal instruments until glowing and applied them directly to flesh, causing severe burns. Surprisingly, cauterization actually did help prevent infection by killing bacteria with heat, though doctors didn’t understand why. The practice caused immense suffering and scarring, but in an era before antibiotics, it sometimes meant the difference between survival and fatal infection following surgery or injury.

Why These Treatments Persisted for Centuries

You might wonder how such bizarre remedies remained standard medical practice for so long. Several factors explain their persistence. First, the authority of ancient texts carried enormous weight—if Galen or Hippocrates recommended something, who were medieval doctors to disagree? Medical education consisted largely of memorizing these classical authorities rather than conducting new experiments.

Second, confirmation bias played a role. When patients recovered after treatment, doctors credited their remedies. When patients died, physicians blamed the disease’s severity or the patient’s constitution. The placebo effect also contributed—believing in a treatment’s power could produce real psychological and sometimes physical benefits, especially for pain or anxiety-related conditions.

Finally, medieval medicine did occasionally work, though usually by accident. Some herbal remedies contained genuinely effective compounds. Cauterization prevented infection. Even bloodletting might temporarily reduce blood pressure. These successes, however random, reinforced belief in the entire system of medieval medical theory.

Frequently Asked Questions

Did medieval doctors know their remedies were dangerous?

Medieval physicians generally believed their treatments were effective and necessary. They operated within a coherent theoretical framework that explained disease and healing differently than modern medicine. When treatments caused harm, doctors typically attributed problems to the patient’s condition or improper application rather than questioning the remedy itself. Some physicians did note which treatments seemed more dangerous, but they lacked the scientific method to systematically test effectiveness and safety.

Were there any effective medieval medical treatments?

Yes, medieval medicine wasn’t entirely useless. Many herbal remedies contained genuinely therapeutic compounds—willow bark for pain relief (containing salicylic acid, related to aspirin), foxglove for heart conditions (containing digitalis), and various antiseptic herbs. Surgical techniques for setting bones and treating wounds showed real skill. Cauterization prevented infection. However, effective treatments succeeded despite medieval medical theory rather than because of it, and were mixed indiscriminately with useless or harmful practices.

How did people afford medieval medical care?

Medical care varied dramatically by social class. Wealthy individuals could afford university-trained physicians who prescribed expensive remedies like theriac containing exotic ingredients. Most people relied on local healers, midwives, barber-surgeons, or folk remedies passed down through families. Monasteries and hospitals provided some charitable care. Many ingredients in common remedies—herbs, animal parts, even excrement—cost little or nothing, making basic treatments accessible across social classes, though quality and expertise varied enormously.

When did medicine move beyond these medieval practices?

The transition was gradual rather than sudden. The Renaissance brought renewed interest in direct observation and anatomy, but bizarre remedies persisted. The Scientific Revolution of the 17th century introduced experimental methods, though bloodletting remained common into the 19th century. Real transformation came with germ theory in the 1860s-1880s, when scientists finally understood disease causation. Even then, some medieval-era treatments lingered into the early 20th century before modern medicine fully replaced them with evidence-based practices.

The Strange Legacy of Medieval Medicine

Looking back at medieval medical practices reveals how far medicine has advanced in just a few centuries. What seemed logical and necessary to trained physicians of the past now appears bizarre and often barbaric. Yet these practitioners weren’t ignorant or cruel—they worked within the best knowledge available to them, trying desperately to heal suffering with the tools and theories they inherited from earlier civilizations.

The strangest aspect might be this: future generations will likely view some of our current medical practices with similar disbelief, wondering how we could have been so misguided. Medical knowledge continues evolving, and today’s cutting-edge treatment may become tomorrow’s cautionary tale.

Sources

• National Library of Medicine – History of Medicine
• Encyclopaedia Britannica – Medieval Medicine
• Science Museum – Medical History Collections