8 signs someone is lying to you 1- A liar's body expressions may not match what they are saying out loud. 2- People's faces often itch when they lie. 3- Liars tend to cover their mouth. 4- They point out a lot. 5- They change their head position quickly. 6- They clear their throat constantly. 7- Liars often speak at a slower pace. 8- They avoid making eye contact.