What is AuDHD?
AuDHD is the word people use when someone has both ADHD and autism. ADHD and autism are two different conditions, but they can exist in the same person at the same time. This overlap is common. Among people with autism, about 1 in 4 also have ADHD. Among people with ADHD, about 1 in 5 also have autism. And many people who have both were never told they had both.
The medical community would describe it as "co-occurring ADHD and autism." But the term AuDHD was developed by the neurodivergent community, and many people with lived experience prefer AuDHD.
You will not find AuDHD in the DSM-5-TR, the book clinicians use to name mental health conditions. That is why it is not a formal diagnosis. However the experience is real and ADHD and autism can be diagnosed in the same person.
Both ADHD and autism shape how the brain has worked since childhood. Both run strongly in families and share some of the same genetic roots. Having both ADHD and autism at the same time isn't just switching back and forth between two separate conditions. When a person has AuDHD the two conditions interact to create a unique neurodevelopmental profile, where the traits constantly intermingle, mask, and balance each other out, making the AuDHD experience its own distinct reality.
Another way to think about it is how we think about colors. For example, blue is blue. Yellow is yellow. Put them together and you do not get blue sitting next to yellow. You get green, which is its own color with its own name. AuDHD works the same way. It is not ADHD and autism taking turns. Research confirms that people with both show patterns in emotion, behavior, and thinking that are different from either condition alone.
One place the picture differs from paint: blue and yellow disappear into green, but ADHD and autism stay visible as themselves. Each can still be recognized, and that matters, because each can be supported in its own way.