In crisis or thinking about suicide? Call or text 988 in the US for the Suicide and Crisis Lifeline, available 24 hours a day. If someone is in immediate danger, call 911.

shrinkopedia.

Part of The Shrink Network

Crisis help
Share this page
Treatment

TMS

also known as transcranial magnetic stimulation

Medically reviewed by the Shrinkopedia editorial team, led by Shariq Refai, MD, MBA, FAPA.

6 min read · 1,252 words

  • Medically reviewed . Reviewed by a board-certified psychiatrist before publication.
  • Sourced from primary literature . DSM-5-TR, NICE, the American Psychiatric Association, the NIMH, Cochrane, peer-reviewed research.
  • Dated and kept current . Every entry shows when it was published, reviewed, and last updated.
  • Honest about uncertainty . Each entry carries an evidence-strength rating and a "what we know and what we don't" section.
  • Independent . No advertising, no affiliate revenue, no sponsored content.
Quick answer

TMS, or transcranial magnetic stimulation, is a noninvasive brain stimulation treatment. A device placed against the scalp delivers focused magnetic pulses to a targeted brain region. The person is awake and alert throughout, with no anesthesia. It's FDA-cleared for depression, OCD, and as an aid in smoking cessation.

Prefer the quick definition? Read this term on Shrinktionary →

Definition

TMS is a noninvasive treatment that uses magnetic fields to influence activity in a specific part of the brain. A coil held against the scalp delivers focused magnetic pulses, and those pulses induce small electrical currents in the brain tissue just beneath.

For depression, the target is commonly the left dorsolateral prefrontal cortex, a region involved in mood regulation. The aim is to nudge the activity of that circuit over a course of treatment. Because it works through the scalp without surgery or anesthesia, it's described as noninvasive.

What it looks like

  • A person comes in on weekday mornings, sits in a chair, and chats or listens to music during the session.
  • They feel a steady tapping on the scalp and hear a clicking sound from the device.
  • After 20 or so minutes, they get up and drive themselves to work.
  • Over several weeks, mood gradually lifts, with the fuller benefit emerging across the course.

What people often confuse this with

ECT. This is the most common mix-up, and the two are very different. TMS uses no anesthesia, induces no seizure, and isn't associated with the memory side effects linked to ECT. The person stays awake and alert throughout.

Surgery or an implant. TMS is noninvasive. Nothing is implanted and nothing breaks the skin. The coil simply rests against the outside of the head.

A one-session fix. TMS is a course of treatment, not a single appointment. The benefit builds over several weeks of regular sessions.

Reality check

Myth: TMS is basically a milder version of ECT.

They're not the same treatment on a sliding scale. TMS uses no anesthesia and induces no seizure, and it isn't associated with the memory side effects connected to ECT. They're distinct procedures with different mechanisms and different profiles.

Myth: TMS is painful or risky.

TMS is generally well tolerated. The most common side effects are scalp discomfort and headache around the time of the session, which often ease as the course goes on. The most serious risk, a seizure, is rare.

Myth: TMS puts you to sleep.

TMS involves no anesthesia and no sedation. The person is fully awake and alert during every session, and can drive and resume normal activities immediately afterward.

What research says

TMS is supported by randomized controlled trials and is FDA-cleared for several uses.

  • Depression. TMS is FDA-cleared for major depression, particularly treatment-resistant depression, meaning people who haven't responded adequately to medication. It was first cleared for this use in 2008.
  • OCD. TMS was later cleared as a treatment for OCD.
  • Smoking cessation. It has also been cleared as an aid in smoking cessation.
  • Evolving protocols. Newer protocols, including shorter forms of treatment, have continued to be developed, and clearances have continued to expand.
  • Tolerability. TMS is generally well tolerated, with scalp discomfort and headache the most common side effects and seizure a rare risk.

Guidance from the FDA, NICE, and clinical trial evidence supports TMS, most established for depression that hasn't responded to other treatments.

What we know and what we don't know

What we know

  • TMS is a noninvasive treatment that uses magnetic pulses to target a brain region, with the person awake throughout.
  • It's FDA-cleared for major depression (especially treatment-resistant depression), OCD, and as an aid in smoking cessation.
  • It's generally well tolerated, with scalp discomfort and headache common and seizure rare, and it's distinct from ECT.

What we don't know

  • Exactly how TMS produces its effects on mood and circuits isn't fully explained.
  • We can't reliably predict who will respond best to TMS.
  • How long the benefits last, and the best approach to maintaining them, is still being studied.

Questions people ask

How does TMS actually work?

A coil placed against the head generates a focused magnetic field that induces small electrical currents in a targeted brain region, most often the left dorsolateral prefrontal cortex. Repeated stimulation over sessions is thought to modulate activity in networks involved in mood regulation. The details of mechanism are still being worked out.

What's a treatment course like?

Standard courses are typically 30 to 36 sessions over about 6 weeks, with sessions lasting 20 to 40 minutes and delivered five days a week. Newer accelerated protocols compress this into shorter timeframes. You're awake, seated, and can leave right after.

Does it hurt?

The sensation is a tapping on the head, sometimes uncomfortable at first and usually well tolerated. Headache is the most common side effect and often improves after the first few sessions.

How effective is TMS?

For treatment-resistant depression, response rates in trials run around 30 to 50 percent, with remission somewhat lower. Not as high as ECT, but with fewer side effects and no anesthesia. TMS is FDA-cleared for depression, OCD, and smoking cessation, with growing evidence for other conditions.

Will insurance cover it?

For treatment-resistant depression, TMS is covered by many insurance plans in the US after documented failure of a certain number of antidepressant trials. Coverage varies by plan and by indication.

What it involves

A typical course of TMS includes:

  • an initial assessment and mapping to set the right coil position and pulse strength
  • sessions on weekdays over roughly 4 to 6 weeks
  • each session lasting from a few minutes to about 20 to 40 minutes, depending on the protocol
  • the person sitting awake and alert in a chair, with no anesthesia or sedation
  • a tapping sensation on the scalp during the pulses
  • the ability to drive and return to normal activities right after each session

Sources

  1. U.S. Food and Drug Administration (FDA). Clearances for transcranial magnetic stimulation devices.
  2. National Institute for Health and Care Excellence (NICE). Guidance on transcranial magnetic stimulation for depression.
  3. Randomized controlled trials of TMS for depression and OCD.
  4. National Institute of Mental Health (NIMH). Brain Stimulation Therapies.

Read how Shrinkopedia builds and reviews its content.

How to cite this page

Short
TMS. Shrinkopedia, medically reviewed by Shariq Refai, MD, MBA. https://shrinkopedia.com/treatments/tms/
APA
Shrinkopedia. (2026, May 24). TMS. Medically reviewed by Shariq Refai, MD, MBA. https://shrinkopedia.com/treatments/tms/
MLA
"TMS." Shrinkopedia, 24 May 2026, https://shrinkopedia.com/treatments/tms/.

Click a citation to select it.

Medical disclaimer

Shrinkopedia is for education, not medical advice. It can't tell you whether TMS is right for you, and it isn't a substitute for care from a licensed clinician. A psychiatrist can help you understand whether TMS fits your situation and what to expect.

If you're in crisis or thinking about harming yourself, call or text 988 in the US to reach the Suicide and Crisis Lifeline, or call 911.

See where this fits in the Atlas: how your mind works →

The Knowledge Path

Walk the connection from this entry outward.

  1. 1 TREATMENT TMS (current)
  2. 2 CONDITION Conditions
  3. 3 SYMPTOM Symptoms
  4. 4 MEDICATION Medications. Understood.
  5. 5 CARE Care at shrinkMD

The Knowledge Path is a curated walk. Every step is one decision away from the next.

Your next step in The Shrink Network

You are here: Shrinkopedia, the concept layer of The Shrink Network.

Understand the idea here first, then follow it to the property that takes it further.

Read a related treatment →

Want to understand more first?

Disclosure: shrinkMD is the clinical care practice within The Shrink Network, the same network that publishes Shrinkopedia. Shrinkopedia takes no referral or affiliate commission for care.

Share this page