16 Ways Your Voice Changes When You're Lying

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When you’re not being entirely honest, you might think you can get away with it without anyone noticing. However, that’s not always the case. In fact, while you might have mastered your poker face, your voice might just betray you in the following ways.

1. Your pitch might get higher.

When you feel stressed, your vocal cords tense up, the Cleveland Clinic explains, and that can make your voice squeakier than usual. It’s your body’s natural reaction to the pressure of trying to pull off a lie, like an internal alarm bell that something’s not quite right. Imagine how your voice sounds when you’re genuinely shocked or scared – that higher pitch can sneak in when you’re fibbing.

2. Your speaking pace changes – you either rush or slow way down.

Liars often speed up, trying to rush through the story before they get caught. They might stumble over words or run sentences together in a blur. Alternatively, some people do the opposite – they slow down significantly because they’re overthinking every word choice. Either extreme is unusual compared to your regular speaking patterns.

3. You throw in way too many details.

When someone’s telling the truth, they usually stick to the main points. Liars, however, sometimes go overboard with specifics, throwing in extraneous details that make the story sound more believable. It’s like they’re trying to paint a detailed mental image so you won’t question their version of events.

4. You start using filler words and phrases excessively.

You know what I’m talking about here — um, ah, like, etc. Everyone uses some filler words, but a liar might take it up a notch. When you’re making stuff up, your brain scrambles to fill the gaps, leading to a lot of stuttering and those meaningless phrases while you desperately try to buy time.

5. Your voice may sound flat and unemotional.

Telling a lie is mentally taxing. Sometimes, the way people cope with that is to focus on controlling their words, which leads to them suppressing all normal emotion from their voice. Instead of sounding natural, they might come across as robotic or unemotional, even if the story they’re telling should have some emotional impact.

6. There are longer pauses than usual in your speech.

Similar to excessive fillers, a liar might insert odd, lengthy pauses where they wouldn’t usually occur. They could be mentally constructing the next bit of the lie, or they’re waiting to gauge your reaction before forging ahead. Either way, the unnatural pauses throw off the normal rhythm of speech.

7. You might abruptly change the subject or deflect the question.

Feeling squirmy when asked something tough? A classic liar move is to completely dodge answering and try to redirect the conversation. They might even get defensive, acting offended that their honesty is being questioned, but they’re really just trying to buy themselves some time.

8. You speak in a very formal manner.

Most of us have a casual way of speaking with people we’re comfortable around. But when someone starts using unusually formal phrasing to tell a casual story, it’s a bit of a red flag, Entrepreneur explains. They’re likely overthinking their word choice and may even have rehearsed parts of what they’re going to say, leading to a stiff, unnatural style of communication.

9. You start clearing your throat way more than normal.

Feeling that tightness in your throat? It’s a physical sign of stress, and a liar might unconsciously try to clear it away. Excessive throat clearing, coupled with some of the other voice changes we’ve talked about, can be a clue that something is off about their story.

10. You overemphasize certain words or phrases.

A liar might place unnatural stress on random parts of their sentences. They might say things like “I did NOT go there” or “I would NEVER do that” with exaggerated emphasis on the denial. It’s an attempt to sound extra convincing, but it often ends up having the opposite effect.

11. You repeat phrases over and over again.

Sometimes, people who are lying latch onto specific phrases and repeat them throughout their story. It’s partly to reinforce the lie in their own mind, and partly an attempt to drill it into the listener’s head. Be wary if the same words or phrases keep popping up out of context.

12. You might slip and use the wrong pronouns.

Ever hear someone say “I mean, she went to the store” when they were clearly the one who went? This pronoun slip-up can be a tell-tale sign, per Psychology Today. It shows their brain is working overtime to maintain the lie, and they might even subconsciously reveal the truth through a mismatched pronoun.

13. You sound almost too eager to please.

Liars sometimes adopt an overly polite, almost submissive tone. They’re trying desperately to come across as cooperative and non-threatening. They might profusely apologize for things that don’t require an apology, or excessively flatter the person they’re talking to.

14. Your voice might waiver or even crack slightly.

Keeping a lie going is stressful! That tension can manifest in slight cracks or wobbles in the voice, especially when confronted with difficult questions. Even the most practised liar can have moments where the strain bleeds through, revealing the emotional turmoil underneath.

15. You might suddenly start whispering.

two women chatting on park bench outdoors — Unsplash

Feeling the walls closing in? Liars might abruptly switch to hushed tones, even in situations where whispering isn’t necessary. It’s like they want to physically minimize the lie, hoping if they make it smaller, it’s easier to conceal. They might also be signalling a false sense of intimacy, hoping you’ll trust them more if it seems like they’re confiding a secret.

16. You avoid contractions.

male and female colleague chatting at cafe — Unsplash

Using contractions like “don’t”, “can’t,” or “won’t” creates a natural rhythm in speech. But when someone’s lying, they’re more likely to expand every word (“do not,” “can not”). It’s because they’re mentally putting extra emphasis on each word in an attempt to hammer home the lie as forcefully as possible.