People in the medieval and early modern periods were superstitious because they lived in a world full of deadly, unpredictable forces they couldn’t explain. Without germ theory, meteorology, or any reliable way to predict crop failures, plagues, or natural disasters, the human brain did what it’s wired to do: it looked for patterns and causes, even where none existed. Superstition wasn’t ignorance for its own sake. It was a survival strategy built on the only frameworks available at the time.
The Brain’s Pattern-Finding Instinct
Superstition has deep roots in how the human mind processes uncertainty. When people can’t determine the actual cause of an event, they tend to lump meaningful patterns together with meaningless ones. A farmer who wore a particular hat the day before a good harvest might wear it again the next season, just in case. This isn’t stupidity. It’s the brain erring on the side of caution.
Evolutionary psychology frames this as a trade-off between two kinds of mistakes. You can wrongly believe something is connected (thinking a black cat caused your bad luck) or you can wrongly dismiss a real connection (ignoring a rustling bush that actually hides a predator). When the cost of missing a real threat is death, natural selection favors minds that over-detect patterns. This “belief engine,” as psychologist Michael Shermer described it, served a dual purpose: it reduced anxiety by giving people a sense of control, and it helped them form causal associations in a world where real causes were invisible.
In the medieval and early modern periods, almost everything that mattered most, your health, your food supply, your children’s survival, was governed by forces no one could see or measure. The instinct to find explanations, any explanations, ran at full speed.
No Science to Fill the Gaps
Before germ theory emerged in the 19th century, people had no way to understand what actually caused disease. The dominant explanation for plague and illness was “bad air,” known as miasma. Physicians believed that thick, cloudy, moist, foul-smelling vapors could corrupt the body’s internal balance and poison a person’s vital spirits. One early modern medical writer described plague as proceeding “from the venomous corruption of the humors and spirits of the body, infected by the attraction of corrupted aire.” Regions with southern winds and stagnant conditions were considered especially dangerous.
Classical writers took this further, framing pestilence as one symptom of nature’s universal decay, a cycle that began in the heavens and trickled down through every layer of the physical world. For many theologians, plague was a sign of God’s anger toward human sin. The first great plague was said to have appeared after the biblical Flood as a mark of divine “indignation,” and later outbreaks were understood as ongoing punishment in a fallen world. Moral corruption, blasphemy, and atheism were said to breed evil spirits, plagues, wars, and famine.
Without microscopes, without any concept of bacteria or viruses, these explanations were genuinely the best available. And they came from the most educated people in society, not just from uneducated peasants.
Witches as Scapegoats for Disasters
When crops failed due to unseasonable weather, or livestock sickened for no apparent reason, communities needed someone to blame. Witches filled that role. They were treated as scapegoats for harvest-destroying cold snaps and disease outbreaks, accused of spreading contagion as agents of the devil. One writer of the period described how witches, “like toads, caterpillars, and flies, attract the poison of the earth, and the infection from the air.”
The scale of these accusations was enormous. In Norway between 1551 and 1760, 730 people were tried for witchcraft and 280 were executed, a 38% execution rate. Hungary saw even harsher outcomes: of 932 people tried between 1520 and 1777, 449 were killed, nearly half. Finland’s execution rate was lower at 16%, but 710 people still faced trial. These weren’t rare, isolated incidents. They were a systematic social response to unexplained suffering.
The Church Drew the Lines
Religion didn’t simply oppose superstition. It shaped which beliefs were acceptable and which were forbidden, often in ways that blurred the boundary between faith and magic. The medieval Church permitted certain healing prayers, but only if they used approved words like references to the Passion, the Cross, or the Lord’s Prayer. A verbal cure was considered legitimate if it invoked God. The same cure was considered demonic if it used unfamiliar names, strange characters, or was spoken over objects like apples or belts rather than directly over a sick person.
Thomas Aquinas argued that words had no natural healing power at all. If a spoken charm appeared to work, it must be drawing its power from demons. Written prayers containing mysterious names or promising specific protections were condemned outright. Even gathering medicinal herbs was regulated: you could say a prayer while collecting them, but only the Creed or the Lord’s Prayer, nothing else.
The Church also claimed the authority to turn a previously acceptable practice into a mortal sin simply by prohibiting it. If you continued using a healing prayer after Church officials banned it, you were guilty regardless of the prayer’s content. Some laypeople, even women, were permitted to perform verbal cures if they lived exemplary lives and showed good judgment, but only so long as their example wouldn’t encourage “indiscreet and superstitious people” to misuse charms. In practice, this created a world where everyday people navigated a complicated, shifting boundary between approved religion and forbidden magic, often without clear guidance.
Protection Rituals in Daily Life
Superstition wasn’t just about explaining disasters. It was embedded in the physical spaces where people lived. Across medieval and early modern buildings, people carved protective symbols into stone, plaster, and wood to ward off evil. The most common was the daisy wheel, a six-petaled flower pattern also called a hexafoil. Overlapping V shapes, known as Marian marks, invoked the Virgin Mary’s protection. In Eastern Europe, the Auseklis cross, a star-shaped symbol associated with night and celestial light, was considered one of the most powerful marks for driving away evil spirits.
These markings appear most often around windows, doorways, and fireplaces, the draughty, vulnerable points where demons and witches were believed to enter a home. People also hid physical objects inside walls and under floors: shoes, dolls, dried cats, and “witch bottles” filled with pins and urine meant to trap or repel malevolent forces. Deliberate burn marks were scored into wooden beams with the belief that controlled fire would protect a building from uncontrolled fire. The vast majority of these marks and concealments date from the medieval period through the early 1800s, spanning centuries of daily, practical engagement with the supernatural.
Medicine Tied to the Stars
Medical practice itself was steeped in what we’d now call superstition. Physicians relied heavily on astrology to time treatments, following guidelines originally laid out in Ptolemy’s ancient text, the Tetrabiblos. Before performing bloodletting, prescribing a purgative, or attempting surgery, a doctor would consult the position of the Moon within the zodiac, the current lunar phase, the time of year, and even the planetary hours of the day.
Each zodiac sign was believed to govern a specific body part, and these associations shifted depending on planetary alignments. Aries normally governed the head, but when the Moon was in Aries, it was thought to govern the knees instead. Performing a procedure near the time of an eclipse was considered especially dangerous. Almanacs and astrological calendars were bestsellers precisely because they helped physicians navigate this system. These weren’t fringe practices. They represented mainstream medicine for centuries.
How Beliefs Passed Between Generations
In a world where most people couldn’t read, superstitious beliefs traveled by word of mouth. Folklore, the collection of traditional beliefs, customs, and stories passed through generations orally, served as a primary vehicle for transmitting social norms. Research on modern populations shows that folklore continues to shape behavior across countries, among second-generation immigrants, and within ethnic groups, suggesting these oral traditions carry real cultural weight long after the conditions that created them have changed.
A grandmother’s warning about not walking under ladders or her insistence on a particular harvest ritual wasn’t just a quirky habit. It was a compressed packet of cultural knowledge, carrying the anxieties and attempted solutions of previous generations. Without formal schooling, scientific institutions, or widespread literacy to offer competing explanations, these inherited beliefs faced almost no challenge. Each generation received them, lived by them, and passed them on.
What Changed With the Enlightenment
The shift away from widespread superstition began in earnest during the 17th and 18th centuries, as Enlightenment thinkers argued that reason, not tradition, should guide human understanding. The core claim was radical for its time: that a real, physical universe existed and could be understood through science, in contrast to the “false, made-up universe of magic suitable only for myths and storytelling.” Deism replaced active divine intervention with the idea of a remote creator who set natural laws in motion and then stepped back.
Enlightenment philosophers directly targeted superstitious beliefs, arguing that events like virgin births or the transformation of wine into blood during Communion simply could not happen according to the laws of nature. The broader argument was that if society could strip away tradition, superstition, and ignorance, people would naturally arrive at a more rational and harmonious world. This didn’t eliminate superstition overnight, but it created the intellectual framework that gradually pushed magical thinking to the margins of respectable thought.
Even so, superstition never fully disappeared. Modern surveys find that roughly 62% of people in Germany, 60% of patients in India, and over 40% of Americans hold superstitious beliefs related to health. In Africa, approximately 70% of people turn to traditional treatments involving charms or spiritual healing. The same pattern-finding instinct that once led medieval villagers to carve daisy wheels above their doors still operates in every human brain, activated whenever uncertainty outpaces understanding.