Trichotillomania is a psychiatric condition marked by recurrent urges to pull out one’s own hair, most commonly from the scalp, eyebrows, or eyelashes. These behaviors are often difficult to control and can lead to visible hair loss, emotional distress, and social impairment. Many people with trichotillomania also experience depression or symptoms similar to obsessive compulsive disorder, suggesting shared underlying brain mechanisms related to impulse control and habit formation.
While psychotherapy and medications can help some individuals, many patients continue to struggle with persistent symptoms. This has fueled interest in neuromodulation approaches that directly target the brain circuits involved in compulsive behaviors. One such approach is transcranial magnetic stimulation, or TMS, a noninvasive technique that uses magnetic pulses to influence neural activity.
How TMS Works In Compulsive Disorders
TMS works by delivering focused magnetic pulses to specific brain regions involved in decision making, motor control, and emotional regulation. In disorders marked by repetitive behaviors, researchers have become increasingly interested in targeting areas linked to habit formation and motor urges.
In the case series reviewed here, clinicians focused on the supplementary motor area, a brain region involved in planning and initiating actions. Overactivity in this area has been linked to repetitive and compulsive behaviors. By applying low frequency TMS, which tends to reduce neural excitability, clinicians aimed to quiet overactive circuits driving hair pulling urges.
Study design And Treatment Protocol
The case series included three individuals diagnosed with trichotillomania who underwent a structured TMS treatment course. Stimulation was delivered using a clinical TMS device, with intensity individualized to each patient’s motor threshold. Treatments were administered at 1 Hz, a frequency commonly used to decrease activity in targeted brain regions.
Each session delivered 1200 pulses to the bilateral supplementary motor area. Patients completed a total of 20 sessions, consistent with protocols used in other compulsive and mood disorders. Importantly, the treatment was well tolerated, and no significant adverse effects were reported.
Measuring Improvement In Hair Pulling
To assess treatment outcomes, clinicians used the Massachusetts General Hospital Hair Pulling Scale. This validated tool measures the severity and frequency of hair pulling behaviors, as well as the distress and impairment associated with them.
Following the full course of TMS, all three patients showed more than a 50 percent improvement on the scale. Patients reported fewer urges to pull hair, improved control over compulsive behaviors, and reduced emotional distress. These changes suggest that TMS for trichotillomania may meaningfully impact both symptoms and quality of life.
Why These Findings Matter
Although the sample size was small, the results are notable given the limited treatment options available for trichotillomania. The findings support the idea that compulsive behaviors may be driven by dysregulated brain circuits that can be modulated with targeted stimulation.
This case series also highlights the importance of individualized neuromodulation protocols. By calibrating stimulation intensity and targeting specific brain regions, clinicians may be able to tailor treatment to the neural drivers of each patient’s symptoms.
What Comes Next For TMS In Trichotillomania
Larger controlled studies are needed to confirm these early findings and determine how long the benefits of TMS persist. Future research may also explore combining TMS with psychotherapy, medication, or behavioral interventions to enhance and sustain treatment effects.
For patients, clinicians, and researchers interested in interventional psychiatry, this work adds to a growing body of evidence that noninvasive brain stimulation may offer new hope for conditions once considered difficult to treat.
Citations
1. Cognitive Function and Treatment Outcomes in Trichotillomania: A Case Series Evaluating the Efficacy of TMS
https://pubmed.ncbi.nlm.nih.gov/41400981/
2. Daily Left Prefrontal Repetitive Transcranial Magnetic Stimulation for Acute Treatment of Medication-Resistant Depression
https://pubmed.ncbi.nlm.nih.gov/21474597/