AuDHD is the informal term for having both ADHD and autism at the same time. Research suggests that somewhere between 30% and 80% of autistic people also meet criteria for ADHD, and the two conditions can mask each other — which is why many people are diagnosed with one long before anyone considers the other. Screening tools can flag traits of each, but only a clinician can diagnose either condition.
Until 2013, you officially could not have both. The DSM-IV explicitly prohibited diagnosing ADHD in someone who was autistic, so an entire generation of clinicians was trained to pick one label and stop looking. The DSM-5 removed that rule, and the numbers that emerged since have been striking: co-occurrence is not the exception but arguably the norm.
How common is AuDHD?
Studies estimate that 30–80% of autistic people also meet criteria for ADHD, and 20–50% of people with ADHD show clinically relevant autistic traits. The wide ranges reflect differences in how studies measure each condition, but even the conservative end makes the combination remarkably common. “AuDHD” is not a formal diagnosis — it is community shorthand for carrying both diagnoses at once.
Genetics helps explain the overlap. Twin studies suggest ADHD and autism share a substantial portion of their heritable risk factors, and both involve differences in executive function, sensory processing, and dopamine signalling. They are distinct conditions, but they draw on partly overlapping neurobiology.
Why the two conditions mask each other
The interesting — and frustrating — part of AuDHD is that the two profiles pull in opposite directions. Autism tends toward routine, predictability, and deep focus on specific interests. ADHD tends toward novelty-seeking, impulsivity, and difficulty sustaining attention. When both are present, each can partially hide the other from view.
An AuDHD person may crave routine yet be unable to stick to one, or hyperfocus for hours on a special interest while being unable to start a ten-minute chore. To an observer — or a clinician using a single-condition checklist — the ADHD traits can make someone look “not autistic enough,” while the autistic traits can make them look “too organized for ADHD.” The result is often a late or missed diagnosis, particularly in women and in adults who have learned to camouflage.
What AuDHD can feel like day to day
People who identify with AuDHD often describe an internal tug-of-war: needing structure but rebelling against it, being overstimulated by environments that are simultaneously understimulating, or oscillating between intense productive bursts and shutdown. Sensory sensitivities, rejection sensitivity, and executive-function difficulties (planning, task-switching, working memory) frequently stack on top of each other rather than averaging out.
None of these experiences is unique to AuDHD, which is exactly why structured screening matters more than symptom-matching from social media. Well-validated instruments look at patterns across many traits rather than a few relatable anecdotes.
How screening for AuDHD works
There is no single “AuDHD test.” In practice, screening combines an ADHD instrument (such as the WHO's ASRS adult ADHD screen) with an autism instrument (such as the AQ-10 or the longer RAADS-R). Our combined AuDHD screening covers traits from both domains in one sitting and shows how strongly you lean toward each profile.
A screening result is a starting point, not a verdict. If your scores suggest elevated traits in either domain, the next step is a proper evaluation with a psychologist or psychiatrist who has experience with adult ADHD and autism — ideally both, given how often they travel together. Formal diagnosis matters because it unlocks accommodations, and because ADHD in particular responds well to treatment that a screener cannot provide.
Why getting the full picture matters
Treating ADHD without recognizing co-occurring autism (or the reverse) often produces confusing results. Stimulant medication may improve focus while making sensory overwhelm more noticeable; social-skills advice built for neurotypical patterns may misfire entirely. People who understand their full profile consistently report that the combined lens explains their history better than either label alone ever did.
If parts of this article felt familiar, a structured screen is a low-stakes way to move from “maybe” toward clarity — and if the results resonate, take them to a professional. Self-knowledge is the goal; a screener is just the map.
Frequently Asked Questions
Is AuDHD an official diagnosis?
No. AuDHD is community shorthand for having both ADHD and autism diagnoses at the same time. Clinicians diagnose the two conditions separately — which has only been permitted since the DSM-5 in 2013.
How common is it to have both ADHD and autism?
Very common. Research estimates 30–80% of autistic people also meet ADHD criteria, and 20–50% of people with ADHD show significant autistic traits.
Can an online test diagnose AuDHD?
No online test can diagnose ADHD, autism, or their combination. Validated screeners can flag traits worth investigating; diagnosis requires a clinical evaluation by a qualified professional.
Why was I diagnosed with one condition but not the other?
ADHD and autism can mask each other — ADHD traits make autism harder to spot and vice versa — and until 2013 clinicians were formally barred from diagnosing both. Many adults, especially women, receive the second diagnosis years after the first.
Wondering where you fall?
Take the free combined AuDHD screening — traits from both domains in about 8 minutes.
Take the AuDHD Screening