It's not uncommon for people with ADHD to be perfectionists. They can get very anxious about small details and “get stuck.”

Is overthinking related to ADHD?

Overthinking can be an all-natural process, it can also be the result if the creative and overly active ADHD brain. While most believe overthinking to be a symptom of obsessive-compulsive disorder, it' actually relates more to ADHD.

In which disorder does a person act like a perfectionist?

Perfectionism is a personality trait characterized by high expectations and standards, while obsessive-compulsive disorder (OCD) is a psychiatric condition where a person experiences intrusive thoughts and/or repetitive behaviors they are unable to control. Perfectionistic tendencies may or may not be a symptom of OCD.