The heart symbol looks nothing like an actual human heart, and nobody is entirely sure how it got its shape. The real answer is that the familiar two-lobed, pointed-bottom icon emerged gradually over centuries, shaped by ancient plants, medieval medical texts, artistic convention, and romantic poetry. No single origin story explains it completely, but several surprisingly good ones overlap.
It Might Start With a Plant
One of the most popular theories traces the shape to silphium, a species of giant fennel that grew along the coast of North Africa. The ancient Greeks and Romans prized silphium for everything from cough remedies to cooking, but its most famous use was as a contraceptive. Women in the colony of Cyrene (in modern Libya) ground up the heart-shaped leaves and ingested them as an early form of birth control.
The Romans were so obsessed with silphium that they stamped silver coins with its seedpod on one side and the blooming plant on the other. Those seedpods have a distinctly familiar shape: two rounded lobes tapering to a point. The plant was harvested to extinction, but the visual connection between its shape and romantic or sexual love may have lingered long after the last stalk was picked. It’s a neat theory, though hard to prove across the gap of many centuries.
Others point to ivy leaves, which share a similar outline and were associated with fidelity in ancient Greece. Ivy was also linked to Dionysus, the god of wine and passion, which gives it a plausible connection to love and desire.
Medieval Medicine Got the Shape Wrong
For most of Western history, nobody had a clear picture of what the human heart actually looked like inside a living chest. Ancient physicians like Galen (2nd century) and the Persian scholar Avicenna (11th century) described the heart as resembling a pine cone: broad at the top, narrowing to a point at the bottom. Medieval artists, who relied on these written descriptions rather than direct observation, painted hearts that way. A famous French manuscript from around 1255 shows a kneeling lover offering his lady a heart that looks very much like a pine cone, pointy end down.
This pine-cone shape was the standard for decades. But somewhere between the 13th and 15th centuries, artists started adding a dent at the top, splitting the broad end into two rounded lobes. Why? It may have been a stylistic choice that simply looked more elegant, or it may have reflected a vague awareness that the real heart has two upper chambers. Either way, the scalloped top caught on. By the 1500s, the shape we recognize today was widespread across European art and heraldry.
A French Love Poem Made It Romantic
The first known image of a heart shape used specifically as a symbol of romantic love appears in a French manuscript called “Le Roman de la poire” (The Romance of the Pear), dated to roughly the 1250s. In one illustration, a young man kneels before a woman and offers her his heart. The object in his hands is still somewhat pine-cone-shaped, not yet the perfectly symmetrical icon we know, but the meaning is unmistakable: the heart represents love given to another person.
Before this moment, heart-like shapes had appeared in decorative art and heraldry for centuries without any strong romantic meaning. The 13th century was the turning point. The symbol developed through the 1300s and 1400s, became popular across Europe by the 1500s, and eventually became so universal that it replaced any memory of its own origins.
It Actually Does Match the Heart (Sort Of)
Here’s the twist most people don’t expect. The symbol may be more anatomically accurate than it looks, just not in the way you’d think. In the 1950s, researchers created the first plastic casts of coronary arteries by injecting material into the aortas of cadavers. The resulting casts, showing the branching network of blood vessels that wrap around the heart’s surface, looked remarkably like the classic heart icon: two rounded lobes at the top, tapering to a point at the bottom.
Later imaging techniques confirmed this. When contrast dye is injected into both the right and left coronary arteries simultaneously, the entire arterial tree forms almost exactly the shape people have been drawing for centuries. The outline of the heart symbol isn’t the outline of the organ itself. It’s closer to the outline of the blood supply that surrounds the organ. Whether medieval artists somehow intuited this, or whether it’s pure coincidence, remains an open question.
Why the Shape Stuck
The heart symbol works because it’s simple, symmetrical, and instantly recognizable. It’s easy to draw, easy to carve into a tree, easy to stamp onto a coin or embroider onto a sleeve. The real human heart, a lopsided muscular lump roughly the size of a fist, would never have caught on as a love icon. The stylized version strips away biological reality and replaces it with a clean visual shorthand that almost anyone on Earth can read at a glance.
There’s also a mathematical echo in the shape. A curve called a cardioid, named in 1741 (the word literally means “heart-shaped”), traces a path that closely resembles the symbol. It’s generated by rolling a circle around another circle of equal size and tracking a single point on the edge. The cardioid wasn’t the inspiration for the heart symbol, since the icon predates the math by centuries, but it shows how naturally the shape arises from simple geometry.
The real answer to “why are hearts drawn like that” is that no one planned it. A combination of ancient seedpods, inaccurate anatomy textbooks, romantic poetry, artistic convention, and sheer visual appeal all pushed the shape in the same direction over roughly a thousand years. By the time anyone thought to ask where it came from, the origin was already buried under layers of cultural repetition.