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How to Spot a Liar

Think you can tell when someone is lying? Odds are, you're wrong. Here's how to actually read the signs.

Dr. Gregory House
Dr. Gregory House

45, Diagnostic Medicine and Problem Solving

Everyone lies. It’s a universal human pastime, right up there with breathing and complaining about the weather. But spotting a lie? That’s a whole different game. You think you’re good at it. Maybe you pride yourself on your instincts, your gut feeling, your uncanny ability to catch a flicker of dishonesty. Spoiler: you’re probably not as good as you think.

Lying isn’t as obvious as Hollywood makes it look. A liar doesn’t always avoid eye contact or nervously shuffle their feet. In fact, the best liars are so good precisely because they know what you’re looking for—and they play around it. To spot a lie, you need to pay attention to the subtler, less stereotypical signals.

Let’s start with the basics: lies create tension. Whether it’s a small fib or a full-blown fabrication, lying triggers a stress response. This stress might show up in microexpressions—those fleeting facial reactions people can’t suppress. A flash of surprise, fear, or disgust that doesn’t match their words can give them away. But these signs are quick, sometimes lasting less than a second. Blink and you’ll miss them.

Then there’s body language. Contrary to popular belief, liars don’t always look away. They might overcompensate, staring directly at you to prove they’re 'truthful.' What’s more telling is inconsistency. If their gestures don’t match their words—like shaking their head while saying 'yes'—you might have caught a disconnect between their brain and their body.

But words themselves? That’s where the real clues hide. Liars often use more vague language. They steer clear of specific details that could trip them up later. They’ll say, 'I was out' instead of 'I was at Joe’s house from 8 to 10.' Watch for unnecessary repetition too. When someone says, 'I swear, I swear, I was telling the truth,' they’re working too hard to convince you.

Here’s the kicker, though: good liars know all of this. They know you’re watching their body language, analyzing their words. They’ve practiced. That’s why the most reliable sign isn’t always in what they say or do, but how they feel. A liar often has an underlying unease. They might be too calm in situations that should upset them or too emotional when calmness would make sense. It’s not what they show—it’s what doesn’t fit.

In the end, detecting lies is less about finding a smoking gun and more about noticing patterns. People are consistent creatures. When something feels off, it usually is. Trust your observations but verify your conclusions. After all, everyone lies. The question is whether the lie matters enough for you to care.

Dr. Gregory House
Dr. Gregory House

45, Diagnostic Medicine and Problem Solving

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