Overthinking and ADHD: is there a link?

In data from two studies of adults, people with ADHD had higher levels of excessive mind wandering than people without it, and that mind wandering added to their difficulties in daily life over and above the core ADHD symptoms.

That finding compares groups of adults who already had ADHD with adults who did not. It says nothing about whether a busy mind means ADHD for you, and neither can this page.

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What studies of adults with ADHD found

The studies on this page do not use the word “overthinking”. They measure two neighbouring things instead: excessive mind wandering and rumination.

In a study of 159 adults with ADHD who were not taking medication, more ADHD symptoms went with more excessive mind wandering and more rumination, which in turn went with more anxiety and depression. The study looked at a clinical group at a single point in time and relied on self-report questionnaires, and its authors say longitudinal studies are needed.

The Kandeğer study looked only at adults with ADHD, and the Mowlem study compared them with adults without it; neither compared “ADHD overthinking” with any other kind. Read them as a pattern in that group, not a checklist for anyone else.

Where anxiety comes in

The NHS notes that people with ADHD may often have other conditions too, such as depression or anxiety.

That is one reason a looping mind is hard to label from the inside. If worry and dread are the bigger part for you, the guide on overthinking and anxiety covers that side.

If you wonder about ADHD

The NHS suggests seeing a GP if you think ADHD symptoms are affecting your studies, work or relationships. The GP may refer you for an assessment with an ADHD specialist, such as a psychiatrist, and may consider other conditions that could be causing the symptoms, such as anxiety.

Before the appointment, it can help to note a few concrete moments: what you were doing, where your attention went, and what it cost you that day. Examples are easier to talk through than a general feeling that your mind never stops.

What to try for a busy mind today

The worksheets on this site are not made for ADHD and do not test for it. They are short, written ways to get a loop out of your head:

  • At night, dump every open thought onto one page and close it until morning.
  • During the day, collect worries in one list and look at them in a single fixed slot.
  • Stuck between options, break the choice down and set a time to decide.

Questions people ask

Is overthinking a sign of ADHD?

This page cannot tell you that. The studies above describe groups of adults who already had ADHD: two compared them with adults without it, one looked only at adults with ADHD. In the NHS an ADHD assessment is with a specialist, after a GP referral.

Is ADHD overthinking different from anxious overthinking?

We did not find a study that answers this cleanly, so we will not guess. If both sound familiar, say so to your GP.

Can the quiz on this site check for ADHD?

No. The “Am I overthinking?” check is a short reflection, not a test, and it does not look for ADHD or any other condition.

When to get help

These are self-help tools, not medical advice or a diagnosis. Talk to a doctor, or to one of the lines below, if:

  • you have thoughts of harming yourself (see the lines below).
  • you feel low or hopeless, and it is not lifting. The NHS suggests seeing a GP if you have had a low mood for more than 2 weeks, or if the things you are trying yourself are not helping.
  • the worry is getting in the way of your daily life. The NHS suggests talking to a GP if anxiety is affecting your daily life.
  • the thoughts feel unwanted and push you to check things or ask for reassurance again and again. OCD involves unwanted, intrusive thoughts that keep coming back, and compulsions such as asking for reassurance or checking. The NHS says it is important to get help if it has a significant impact on your life.

Lines you can call

  • US:988 Suicide & Crisis LifelineCall or text 988Free and confidential, 24/7. You can also chat at 988lifeline.org.
  • UK & Ireland:Samaritans116 123Free to call, day or night.
  • England:NHS 111111, mental health optionUrgent help from the NHS when it is not an emergency.

In the US, in life-threatening situations, call 911. In the UK, if someone's life is at risk, call 999 or go to A&E. For urgent help in England, use NHS 111 online or call 111 and choose the mental health option. Elsewhere, call your local emergency number.

Sources

  1. Mowlem FD, Skirrow C, Reid P, Maltezos S, Nijjar SK, Merwood A, Barker E, Cooper R, Kuntsi J, Asherson P (2019). Validation of the Mind Excessively Wandering Scale and the Relationship of Mind Wandering to Impairment in Adult ADHD. Journal of Attention Disorders 23(6):624–634. PMID 27255536
  2. Kandeğer A, Odabaş Ünal Ş, Ergün MT, Yavuz Ataşlar E (2024). Excessive mind wandering, rumination, and mindfulness mediate the relationship between ADHD symptoms and anxiety and depression in adults with ADHD. Clinical Psychology & Psychotherapy 31(1):e2940. PMID 38053250
  3. ADHD in adults. NHS. nhs.uk
  4. Low mood, sadness and depression. NHS. nhs.uk
  5. Anxiety. NHS Every Mind Matters. nhs.uk
  6. Symptoms - Obsessive compulsive disorder (OCD). NHS. nhs.uk
  7. Where to get urgent help for mental health. NHS. nhs.uk
  8. Suicide Prevention. National Institute of Mental Health (NIMH). nimh.nih.gov
  9. 988 Suicide & Crisis Lifeline. 988 Suicide & Crisis Lifeline. 988lifeline.org
  10. Contact a Samaritan. Samaritans. samaritans.org

Sources checked claim by claim by an AI review. Approved for publishing by Oleksii Y. on 2026-10-05.

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