One in 36 children in the United States has autism, according to the Department of Health and Human Services (HHS) — but many don’t learn they’re on the spectrum until adulthood.

Those who grow up without a diagnosis can experience symptoms that are overlooked or misunderstood.

One in every 45 adults in the U.S. is diagnosed with autism spectrum disorder (ASD), according to Autism Speaks, a national nonprofit for autism awareness .

Although there’s a current uptick in autism advocacy and education, there are likely “many adults” who never received a diagnosis or were misdiagnosed, the New Jersey-headquartered organization states on its website.

If you think you or someone you love may be on the spectrum, here’s what autism can look like in adults.

Common characteristics

ASD is defi

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