5 Bizarre Medieval Medical Treatments That Were Worse Than the Disease

Imagine stepping into a dark, candlelit room in 14th-century London, shivering with fever and bone-deep agony. You have called for medical aid, expecting comfort and relief. Instead, a man wearing a blood-stained apron rolls up his sleeves, lays out a set of iron saws, rusty blades, and glass jars filled with squirming leeches. In medieval Europe, falling ill was often a death sentence, but seeking a doctor's cure was frequently far worse.

Long before the discovery of germs, bacteria, or modern anesthesia, medieval medicine was governed by superstitious theories, religious dogma, and terrifying trial-and-error procedures. Doctors believed the human body was controlled by four bodily fluids known as humors: blood, phlegm, yellow bile, and black bile. When a patient fell ill, physicians concluded that these humors were out of balance and used unspeakable methods to restore equilibrium. Here is the nightmare story of five terrifying medieval medical treatments that inflicted far more agony than the diseases they sought to heal.

The Nightmare of Bloodletting and Leeching

If you walked into a medieval clinic complaining of a headache, indigestion, or smallpox, the universal prescription was almost guaranteed to be bloodletting. Physicians believed that excessive blood accumulated in the organs, harboring dark toxins that needed to be drained immediately.

The procedure was carried out either by trained physicians or local barbers, who doubled as surgeons. Using a spring-loaded metal blade called a scarificator, the barber would slice open veins in the patient's arm, neck, or under the tongue. Blood was collected in wooden bowls until the patient paled and fainted from severe blood loss.

For more sensitive conditions, doctors turned to hirudotherapy—applying dozens of hungry, squirming leeches directly onto open wounds, eyelids, or inside the mouth. Millions of patients died not from their original infections, but from hemorrhagic shock and secondary bacterial sepsis caused by unwashed rusty blades.

Trepanation: Drilling Holes into the Human Skull

For those suffering from severe migraines, epileptic seizures, or erratic behavioral changes, medieval physicians offered a drastic neurological remedy known as trepanation. They believed mental instability and head pain were caused by evil spirits trapped inside the skull, or by trapped pressure within the brain tissue.

The treatment required the surgeon to physically bore a hole into a conscious patient's skull. Without a single drop of effective painkiller, the victim was pinned down by several muscular assistants. The surgeon used a T-shaped drill or a crude circular saw to bore through the bone until the dura mater, the protective outer membrane of the brain, was exposed.

While a shocking number of archaeological skulls show signs of bone healing—proving some patients survived the initial ordeal—countless others succumbed to catastrophic brain hemorrhages, irreversible neurological damage, and fatal cranial infections.

Corpse Medicine: Ingesting Human Remains for Healing

Perhaps the most morbid and grotesque chapter in European medical history was the widespread practice of cannibalistic medicine, commonly known as corpse medicine. From the Middle Ages well into the 17th century, physicians believed that consuming parts of a fresh human corpse transferred the deceased person's vital life spirit to the sick patient.

Mummies smuggled from Egyptian tombs were ground into a fine black powder called mumia, which was mixed with wine or honey to treat internal bleeding and stomach ulcers. Powdered human skull was prescribed as a cure for epilepsy, while human fat was rubbed over limbs to alleviate arthritis and bone aches.

The most coveted substance was the fresh blood of executed criminals. Spectators would gather around execution scaffolds holding tin cups, waiting to catch warm blood spraying from newly decapitated corpses to drink it instantly on the spot as a remedy for blood disorders.

Mercury Treatments: The Toxic Poisoning Cure

When syphilis spread rapidly across Western Europe in the late 15th century, medical practitioners rushed to find a cure for the agonizing skin lesions and systemic destruction caused by the disease. Their chosen miracle drug was mercury, an insanely toxic heavy metal.

Patients were subjected to extreme mercury therapy through several horrifying methods. They were forced into sealed, heated ovens where they inhaled toxic mercury vapors, or had mercury-based ointments rubbed vigorously into open sores. The logic was that heavy salivation, sweating, and diarrhea caused by mercury exposure were signs that the body was expelling the disease.

In reality, patients were suffering from acute heavy metal poisoning. Their teeth fell out, their gums rotted and turned black, bone tissue deteriorated, and many suffered severe brain damage and organ failure long before syphilis could take their lives.

Hot Iron Cauterization and Boiling Oil

In an era long before antiseptic ointments, surgical wounds and battlefield amputations posed an immediate threat of gangrene and fatal blood loss. To seal open blood vessels and prevent infection, medieval military surgeons relied on brutal cauterization.

Surgeons heated heavy iron rods over glowing embers until they glowed bright red, then pressed the searing metal directly onto open wounds and freshly severed limbs. The agonizing stench of burning human flesh filled field hospitals as patients shrieked in agony, frequently going into fatal cardiogenic shock.

When iron rods were unavailable, surgeons poured boiling elderberry oil directly into open gunshot and sword wounds. It was not until the Renaissance that pioneer surgeons like Ambroise Paré proved that gentle soothing ointments were vastly superior to burning oil and red-hot irons.