When ADHD and autism occur together

For a long time the diagnostic manuals did not permit both diagnoses at once. That changed with DSM-5 in 2013, but clinical habits move slower than manuals, and plenty of adults were assessed under the older assumption that it had to be one or the other.

Why the combination is easy to miss

The two conditions pull in opposing directions on several traits, and the result can look unremarkable in the middle.

• A strong need for routine, alongside difficulty maintaining one
• Deep, sustained special interests, alongside an inability to start tasks that are not interesting
• Social exhaustion, alongside impulsive over-committing to social plans
• Sensory overwhelm, alongside sensory seeking

People describe the internal experience as being at odds with themselves — wanting predictability and undermining it, needing stimulation and being flattened by it.

Why it is worth identifying both

Because the responses differ. ADHD has effective medication options; autism does not, and anyone offering medication to treat autism itself is not being straight with you. Support for autism is about environment, adjustments and understanding, while ADHD treatment is often pharmacological alongside practical strategy.

Identify only the ADHD and you may medicate successfully while leaving the sensory and social load untouched. Identify only the autism and you may build a well-adjusted environment that executive dysfunction still makes unworkable.

Assessing for both

Whether that happens in one appointment or two depends on the picture. A clinician who assesses both should be able to advise which is appropriate before you book, rather than selling two assessments by default.