Two conditions can look almost identical from the outside. The reason behind the behavior can be completely different.
A repeated movement might be a stim, a compulsion, or both at different times. A focused interest can be absorbing and restorative, while an OCD obsession is intrusive and unwanted. A routine can protect predictability, while a ritual can be an attempt to remove doubt. When those patterns are confused, assessment and treatment can miss the real target.
Is It Autism or OCD? gives adults a plain-language way to examine the overlap without pretending a book can diagnose them. Using the Four-Clue Overlap Map, you will learn to look at trigger, function, interruption, and history before deciding what a behavior means.
The book puts the hardest comparisons side by side: stims and compulsions, routines and rituals, special interests and obsessions, sensory distress and fear, sameness and certainty, intrusive thoughts, mental rituals, and co-occurring autism and OCD. Worked composite examples show how two identical-looking behaviors can have different internal jobs.
It also explains why treatment fit matters. ERP is an established treatment for OCD, including for some autistic people when CBT is appropriately adapted. That is different from treating every repetitive autistic behavior as a compulsion. The book gives you questions to ask about treatment targets, sensory needs, developmental history, and the possibility that both conditions are present.
This book is for readers who have one diagnosis but still have unanswered questions about the other, who found a previous treatment plan incomplete or mismatched, or who want clearer language before an autism or OCD assessment.
If you want a structured way to turn "I can't tell what this is" into concrete examples a clinician can examine, this book offers a practical place to begin.
