Why Does Breaking a Mirror Mean 7 Years of Bad Luck?

Breaking a mirror became “bad luck” because people long treated mirrors as magical objects—tools for fortune-telling and stand-ins for the self. The “seven years” part shows up in English print by 1813. The popular claim that Romans chose seven because the body renews every seven years has no ancient source, and the biology is wrong too.

You reach for your toothbrush, your elbow clips the mirror, and the whole thing lands in the sink in jagged pieces. Before you even grab a towel, a little voice in your head says it: seven years.

It’s one of the best-known everyday beliefs about bad luck. Almost everyone knows the rule, but very few people know where it came from. So why does breaking a mirror mean 7 years of bad luck? The real story is stranger than the one you usually hear, because the most popular explanation has a missing piece right in the middle.

Where Does the Broken Mirror Superstition Come From?

Long before glass mirrors, people saw themselves in still water and polished metal or stone. Those early mirrors were small, rare, and expensive. Something that showed you yourself, on demand, felt a little like magic—and in some hands, it was used that way.

The oldest clear English record of the superstition comes from 1777. The antiquarian John Brand wrote that breaking a looking glass was “accounted a very unlucky accident,” and he offered a reason: mirrors had once been used by magicians and in an old kind of fortune-telling by looking glass, according to the original text transcribed by word historian Pascal Tréguer. Brand’s guess was that the fear of breaking one grew out of that magical reputation.

Ten years later, the lexicographer Francis Grose recorded a darker version. In his 1787 collection of popular superstitions, a broken looking glass didn’t mean a rough patch. It meant a death in the family, usually the head of the household.

You’ll also see a second explanation everywhere online: your reflection holds a piece of your soul, so breaking the image damages you. That’s a popular (but unproven) theory. It does capture a feeling most people recognize, though. Watching someone tear up a photo of you stings, even if you know it’s just paper. A shattered reflection hits the same nerve.

The “Romans Did It” Story—and Why It Doesn’t Hold Up

Here’s the version repeated in nearly every article on this topic: the Romans invented glass mirrors, the Romans believed life renews itself every seven years, so breaking a mirror meant seven years of misfortune until your body “reset.”

It’s a tidy story. It has three problems.

First, the Romans didn’t invent glass mirrors. The Roman writer Pliny the Elder actually credited glass mirrors to Sidon, a city in modern Lebanon, in the first century AD—and the earliest surviving examples date to the second century AD, according to University College London’s collection notes.

Second, the Roman “seven-year renewal” belief has no paper trail. We looked for an ancient Roman text behind the claim and couldn’t find one. Modern explainers tend to cite each other or recent books, not a Roman author. It works like a chain email: every forward adds a confident “historians say,” but nobody can find the original sender.

Third, there’s a gap of more than 1,500 years. The earliest English records from the 1700s don’t mention Romans at all, and they don’t mention seven years either.

None of this proves the Romans had no mirror superstitions. It just means the neat Roman explanation is a popular theory, not documented history.

Why Seven Years? Tracing the Number

So when does “seven years” actually appear? The earliest known record so far is from December 1813. A letter in The Scourge, a London magazine that mocked superstition, described a girl in tears because she’d broken a looking glass—and her mother had told her it meant seven years of ill luck. By the 1830s, the phrase was turning up in newspapers and magazine fiction as something everyone understood.

Why seven, specifically? Nobody knows for sure. Seven was already a heavyweight number in Western culture—seven days in a week, seven deadly sins, seven wonders—so it was a natural pick for anything that needed to sound official. Another explanation you’ll find online says seven years was roughly what a servant would have to work to pay for an expensive mirror. That’s a popular theory with no solid evidence behind it.

What’s interesting is how the punishment changed. In Grose’s 1787 version, a broken mirror foretold a death. The seven-year version is milder, and it comes with a built-in end date. Think of it like a parking ticket instead of a prison sentence: unpleasant, but you know when it’s over. A curse with an expiration date is a lot easier to live with.

How It Spread (and Variations Around the World)

As glass mirrors became cheaper and showed up in more homes, there were simply more mirrors to break—and more chances to repeat the rule. The belief became one of those household sayings passed down like a family recipe, part of the strange world of superstitions that people follow half-jokingly.

Mirrors carry other weighty customs too. In many Victorian homes, mirrors were draped or covered after a death. In Jewish tradition, families commonly cover mirrors during shiva, the week of mourning, and people explain the custom in different ways—from old beliefs about spirits to the idea that mourning is a time to look inward, not at yourself. These customs aren’t about luck, but they show how much meaning people have attached to reflections.

The superstition even became a sales pitch. A January 1941 issue of Popular Science featured a steel mirror with a chrome coating and joked that nobody could get seven years of bad luck by breaking it. When marketers start using a superstition as a selling point, you know it’s gone mainstream.

Why Our Brains Fall for It

Your brain is a pattern-finding machine. That’s useful when you’re learning which foods make you sick or how traffic moves before you cross a street. But as sociologist Barry Markovsky explains, the brain also infers cause-and-effect patterns that aren’t real, and we often pick up superstitions from parents and other trusted adults while we’re young.

Picture your brain as an overeager detective. It would rather arrest the wrong suspect than leave a case unsolved. So when your car gets a flat tire a week after a mirror cracks, the mirror becomes Suspect No. 1.

Then confirmation bias does the rest. You remember the flat tire. You forget the 50 perfectly normal days around it. Over time, the “hits” pile up in your memory and the misses quietly disappear.

The remedies play into another quirk. Tossing salt or burying shards gives you something to do, which feeds a mental shortcut called the illusion of control —the feeling that a small action can steer random events.

Does Science Support It?

There’s no evidence that breaking a mirror changes your luck. Mirrors are glass with a reflective metal backing. When one breaks, the only guaranteed consequence is sharp pieces on the floor.

The bonus twist is that the explanation behind the number is a myth too. The idea that your body replaces all its cells every seven years is widely repeated, but stem cell researcher Jonas Frisén of Karolinska Institutet has said there is no scientific evidence for it. His team dates human cells using carbon-14 left in the atmosphere by nuclear tests in the 1950s and early 1960s, and turnover varies enormously by tissue. Skin repairs itself readily. The heart and brain regenerate far less.

So the popular “scientific” reason for the superstition is itself a kind of superstition. It’s a myth explaining a myth.

What People Do to “Undo” the Bad Luck

Folk tradition offers plenty of escape hatches. Here are the most common ones people still mention:

• Toss salt over your left shoulder. This borrows from why spilled salt gets tossed over a shoulder, a counter-charm used for many kinds of bad luck.
• Spin around three times counterclockwise. Doing this normally is said to bring bad luck, but right after breaking a mirror it supposedly reverses the curse.
• Bury the pieces. Some versions say to do it under a full moon.
• Put the pieces in a south-flowing stream. According to this version, the water carries the bad luck away in seven hours instead of seven years.
• Grind the shards to dust, so no broken reflection can ever be seen in them again.

The one step that actually protects you is less magical: handle the glass carefully. Wear gloves or use thick paper, sweep up the big pieces, and wipe the area with a damp paper towel to catch the slivers you can’t see.

Frequently Asked Questions

Related Superstitions

• If you’ve ever stepped off the sidewalk to avoid a ladder, here’s the ladder rule you sidestep without thinking.
• For another number with a bad reputation, read the history behind Friday the 13th.
• Another familiar household superstition warns against opening an umbrella indoors. Discover why opening an umbrella indoors is considered bad luck and what the historical evidence actually tells us.

Sources

1. Pascal Tréguer, word histories — “‘seven years’ bad luck’: meaning and origin” — https://wordhistories.net/2025/07/12/seven-years-bad-luck/
2. University College London, Digital Egypt for Universities — “Mirrors in Egypt (Old Kingdom – Roman Period)” — https://www.ucl.ac.uk/museums-static/digitalegypt/metal/mirrors.html
3. Barry Markovsky, The Conversation (republished by the University of South Carolina) — “How did the superstition that broken mirrors cause bad luck start and why does it still exist?” — https://sc.edu/uofsc/posts/2021/06/06_conversation_broken_mirror.php
4. Knut and Alice Wallenberg Foundation — “A family tree from stem cell to neuron” (interview with Jonas Frisén) — https://kaw.wallenberg.org/en/research/family-tree-stem-cell-neuron