Written using peer-reviewed research including Chesivoir et al. (2022, Comprehensive Psychiatry), Grant, Dougherty & Chamberlain (2020, Psychiatry Research), the CNS Spectrums meta-analysis of cognition in trichotillomania, Golubchik et al. (2011, Clinical Neuropharmacology), and published case reports of stimulant-associated hair pulling.
In the largest study to ask the question directly, 15.3% of adults with trichotillomania also met the clinical threshold for ADHD. An earlier general-population survey put it closer to 29%. Adult ADHD sits at roughly 2.5% in the wider population, so whichever end of that range is nearer the truth, ADHD is several times more common among people who pull their hair than among people who don't.
That's the answer to the question most people arrive with. The more useful part is what the overlap is actually made of, because it isn't the vague low-dopamine story that most pages give you, and because it changes which parts of treatment are worth your effort first.
If you want the ground floor on the condition itself, how it's defined and how it's diagnosed, the full guide to trichotillomania covers it.
How Often the Two Occur Together
Two studies carry most of the weight here, and they disagree by a factor of two.
Chesivoir and colleagues assessed 308 adults with a current trichotillomania diagnosis using a structured diagnostic interview alongside the Adult ADHD Self-Report Scale. Forty-seven of them, 15.3%, met the threshold for ADHD.
Grant, Dougherty and Chamberlain surveyed 10,169 US adults and found 175 with current trichotillomania. Seventy-nine percent of that group had at least one other mental health condition. Anxiety and depressive disorders came first, then OCD, PTSD, and ADHD, with the ADHD figure reported at 29%.
What neither study can tell you is the other direction, how many people with ADHD pull their hair, because both samples were recruited for pulling in the first place.
Two things are worth holding onto from those numbers. Anxiety and depression are still the more common companions to hair pulling; ADHD is a strong third or fourth. And a large share of people with both conditions only ever get one of them named.
What the Overlap Is Actually Made Of
Most articles explain this link by pointing at dopamine and stopping there. The research has something more specific to offer.
The most consistent cognitive finding in trichotillomania is a deficit in motor response inhibition, measured on a task called the stop-signal task. You press a key as fast as you can when a symbol appears. Occasionally, a fraction of a second after the symbol, a stop cue arrives and you have to abort the press you've already begun. What the task measures isn't whether you can decide to stop. It's how many milliseconds it takes you to cancel a movement that's already underway.
That pattern of results is narrow, and the narrowness is the point. This isn't a picture of a generally weak executive system. It's one specific braking mechanism running slow, in a profile that's otherwise intact.
Impaired response inhibition on the stop-signal task is one of the most replicated findings in ADHD too. It's the clearest measured thing the two conditions share, and it's a far better description of the experience than "poor impulse control" is. The hand is already on the way up. What's slow is the cancel.
Situation matters on top of the mechanism. Pulling in ADHD tends to cluster in two opposite states: absorbed attention, where the hand runs unsupervised while you read or drive or scroll, and the stalled start of a task you can't make yourself begin, where pulling delivers a small immediate reward in place of a large delayed one. Both are more common when the brain is under-engaged rather than distressed, which is why plenty of people with ADHD pull hardest when nothing is wrong.
Does Having ADHD Make the Pulling Worse?
This is where the evidence turns counterintuitive.
In the same 308-person study, the adults with ADHD and the adults without it did not differ significantly in trichotillomania severity, perceived quality of life, or functional impairment. Nor did they differ by age, gender, race, or education. That runs against the general pattern in comorbidity research, where adding ADHD to another psychiatric condition usually predicts more impairment and poorer treatment response.
Some caution is warranted. That's one cross-sectional sample using self-report scales, and "no measured difference in severity" is not the same as "feels no harder day to day." Living with two conditions is more to manage than living with one, and nothing in that finding says otherwise.
Still, if part of what brought you here was a suspicion that having both makes you a harder case, the best available data doesn't support it.
Will ADHD Medication Help or Worsen the Pulling?
The evidence here points in three directions at once, and any page that gives you a clean answer is leaving something out.
There are case reports of stimulants triggering pulling. Clinicians at the Yale Child Study Center described three boys aged 7 to 12 whose hair pulling began or worsened within six months of starting methylphenidate. A later review of published case reports collected eight cases of stimulant-associated trichotillomania across the literature, seven of them in children and one in an adult. Methylphenidate, amphetamine and lisdexamfetamine were all implicated. Pulling started anywhere from a few days to a few months after beginning the medication or increasing the dose, and in almost every case it resolved or dropped substantially after the medication was stopped. One patient's pulling returned when the medication was reintroduced.
There is a small trial where it did neither. Nine children and adolescents with both ADHD and trichotillomania took methylphenidate for twelve weeks. Their ADHD symptoms improved significantly. Their hair pulling didn't change significantly in either direction.
And there is the group data, which shows no average effect. In the 308-adult study, the participants with ADHD who were taking a stimulant and those who weren't showed no significant difference in pulling severity, impulsivity scores, quality of life, or functional impairment.
Those findings fit together better than they first appear. Case reports capture rare events that happen to identifiable people; they don't tell you how often. Group comparisons capture the average and can hide a small number of strong reactions inside it. So: stimulant-triggered pulling looks real but uncommon, concentrated in children, and clustered around the start of treatment or a dose increase. On average, across a population of medicated adults, stimulants neither improve nor worsen hair pulling.
What Changes About Treatment When You Have Both
Habit reversal training is the first-line behavioral treatment for hair pulling, and it has four components: awareness training, competing response training, stimulus control, and social support. The full walkthrough of HRT for hair pulling goes through them one at a time. The standard order teaches awareness first. That ordering makes sense for the average person and less sense for yours.
Expect awareness training to be the hard part, and don't read that as failure. It's the component that leans hardest on the timing mechanism the research says is slow in both conditions. In the acceptance-enhanced behavior therapy trial, better pre-treatment response inhibition predicted a better outcome regardless of which treatment people received. That's a reason to lean on the parts of the protocol that don't depend on it.
Front-load stimulus control. This is the component that works by changing the environment rather than by catching yourself in time, which makes it the piece that pays off most for an ADHD brain. Physical friction on the specific sites you pull from: a beanie or bandana while reading, adhesive bandages on the fingertips you pull with, keeping nails short, gloves during television. Also the setup around it, since pulling is often anchored to a particular chair, a particular light, a particular mirror.
Make the competing response interesting enough to actually use. The textbook example is clenching a fist for a minute. For a nervous system that's pulling partly for stimulation, a fist clench offers nothing, and people abandon it within days. A textured stone, therapy putty, a spinner ring, something with real sensory content, gets used. The competing response has to occupy the hand for the sixty seconds an urge takes to pass, and it has to be something the hand wants. There's more on building one that sticks in the practical guide to stopping hair pulling.
Treating the ADHD is worth doing on its own terms. A properly supported executive system makes every behavioral strategy easier to keep running. It isn't a treatment for hair pulling, and it would be misleading to sell it as one, but it changes how much of the work you can sustain.
What to Bring to the Appointment
Four weeks of data will change the conversation more than anything you can say from memory.
Log when you pull, what you were doing at the time, whether you noticed before or after it started, and, just as importantly, the urges you didn't act on. If you're on medication, note the time of each entry against your dosing schedule; a cluster in the hour a dose wears off is a specific, answerable finding, and so is a cluster that has nothing to do with the medication at all.
Then ask for two things by name. Behavior therapy with habit reversal training, because it's the first-line treatment and it isn't always what gets offered first. And a direct conversation about the timing question if your pulling and your prescription started close together.
If you pick your skin as well as pull, which a majority of people with trichotillomania do, the same overlap applies there and works slightly differently.
Four weeks of data, without the notebook
SkinAware logs pulls and resisted urges with the trigger, the time, and how you felt, then shows you the patterns underneath. Built for hair pulling, skin picking, and nail biting.
Frequently Asked Questions
No. Trichotillomania is its own diagnosis, in the obsessive-compulsive and related disorders chapter of the DSM-5, and ADHD is diagnosed separately. They co-occur far more often than chance, but neither one is a symptom of the other, and having both means having two conditions that each deserve attention.
In a small number of documented cases, stimulants have triggered or worsened hair pulling, mostly in children and typically within days to months of starting or increasing a dose. Across larger groups of medicated adults, no average effect on pulling severity has been found. If your pulling began close in time to a medication change, tell your prescriber with dates. Don't stop or adjust a medication on your own.
Because pulling supplies stimulation as well as relief. When attention is under-engaged, reading, driving, sitting through a call, the hand goes looking for input, and hair provides it reliably. Stress-driven pulling is real too, but the under-stimulated kind is the one people most often overlook, partly because it doesn't feel significant while it's happening.
The available evidence doesn't suggest so. In the largest study to compare them, adults with trichotillomania who also had ADHD showed no significant difference in pulling severity, functional impairment, or quality of life compared with those who didn't. What does change is which parts of treatment to lead with.
Usually both, and there's no need to sequence them. Treating ADHD makes behavioral strategies easier to sustain but won't resolve hair pulling on its own. Treating hair pulling with habit reversal training works whether or not the ADHD is medicated. The main risk is treating one and never naming the other, which is common.
Bring it to whoever manages their ADHD care, and bring the dates. The stimulant case reports are concentrated in children, so the timing relative to any medication change is genuinely relevant information for a prescriber. Behavior therapy is first-line for children as well as adults. Hair pulling in this age range is common enough that it should be met with practical help rather than alarm.