Why do some autistic people smirk when they’re nervous?

Have you—or your child—ever been told off for smirking in an uncomfortable situation? I have a friend who used to do this, and at the time, I didn’t understand why. Now I do.

Many autistic and neurodivergent people experience this as an involuntary reaction to anxiety, discomfort, or sensory overload. It’s not rudeness or amusement—it’s simply the way their body processes intense emotions.

Studies show that around 80% of autistic people experience differences in facial expressions and body language, which can lead to painful misunderstandings. Conditions like ADHD and Tourette’s syndrome can also cause involuntary facial expressions in response to stress.

Why does this happen?

✔ Emotional processing differences – The brain may express emotions in ways that don’t align with social expectations.
✔ Masking & social anxiety – Trying to suppress emotions can sometimes lead to unintended facial expressions.
✔ Sensory overload – The nervous system reacts in ways that may seem ‘out of place’ to others.

How can we help?

✔ Understanding – Recognising that a person’s facial expression doesn’t always reflect their true feelings.
✔ Support – Encouraging self-regulation through grounding techniques, fidget toys, or deep breathing.
✔ Advocacy – Educating others that this is a natural neurodivergent response, not a behaviour to be punished.
✔ Empathy – Instead of assuming, ask, listen, and offer kindness.

It’s time to evolve, to show more empathy, and to break the cycle of shame and misunderstanding. If a child smirks in an uncomfortable moment, don’t reprimand them—support them. Their reaction isn’t wrong; it’s simply different.

Have you or your child experienced this? Let’s start a conversation.