By Dr. Gurvinder Arora ยท October 27, 2026
What Is TMS Therapy?
Transcranial Magnetic Stimulation (TMS) is a non-invasive, FDA-cleared treatment that uses magnetic pulses to stimulate areas of the brain involved in mood regulation. It is most often used for depression, including depression with anxiety symptoms, that hasn’t improved enough with medication, and it requires no surgery, no anesthesia, and no recovery time.
If you or someone you love has tried one or more antidepressants without the relief you hoped for, or has struggled with side effects, TMS may be a worthwhile option to discuss with your psychiatrist. This guide covers how TMS works, what treatment feels like, who it helps, and what to expect.
Safety First
Your safety is our priority at every step. Here is what to know up front:
- Non-invasive. No surgery, no anesthesia, and no sedation. You stay awake and alert.
- FDA-cleared and clinician-supervised. Treatment uses FDA-cleared devices and is overseen by your psychiatrist and a trained treatment team.
- Carefully screened. Before starting, we review your medical history, medications, and any implants or devices to confirm TMS is safe for you.
- Mild, short-lived side effects. The most common are scalp discomfort and mild headache, which usually fade within the first one to two weeks.
- No effect on memory. TMS does not cause memory loss, weight gain, or sexual side effects.
- Seizures are rare. The risk is very low, and screening and protocols are designed to reduce it further.
- Some people should not have TMS. This includes people with certain metal implants in or near the head, such as aneurysm clips or cochlear implants.
Tell your care team right away about any discomfort or unusual symptoms during treatment. Settings can be adjusted for your comfort, and you can pause a session at any time.
How Does TMS Work?
TMS uses a small electromagnetic coil placed against the scalp. The coil delivers brief magnetic pulses, similar in strength to those used in an MRI machine, that pass painlessly through the skull and gently activate nerve cells in a targeted brain region.
For depression, that region is typically the left dorsolateral prefrontal cortex, an area that tends to be less active in people with depression and that connects with the brain’s mood-regulation circuits. Repeated stimulation over a course of treatment is thought to strengthen these connections and help the brain’s mood networks work more normally.
Unlike medication, TMS acts directly on specific brain areas rather than circulating through the whole body. That is why many patients experience fewer systemic side effects, such as weight gain, sexual side effects, or drowsiness.
Who Can TMS Help?
TMS was first cleared by the FDA for major depressive disorder in adults who had not benefited from antidepressant medication. Since then, certain devices have been cleared for additional uses. Depending on the device and protocol, TMS may be considered for:
- Major depression, including depression with anxiety symptoms, particularly when one or more medications haven’t worked well enough or caused intolerable side effects
- Obsessive-compulsive disorder (OCD), using specific deep TMS devices
- Smoking cessation, using a specific deep TMS device
- Depression in adolescents, with certain devices cleared for older teens
TMS is also studied for other conditions, such as anxiety, PTSD, and bipolar depression, but these uses are less established. Your psychiatrist can tell you whether TMS is an appropriate, evidence-supported choice for your situation.
TMS can be used on its own or alongside medication and psychotherapy. You do not have to stop your current treatment to try it.
What to Expect During Treatment
A typical TMS course involves daily sessions, five days a week, for about four to six weeks. Many protocols include a short taper period at the end. Session length depends on the protocol and device, ranging from just a few minutes to around 40 minutes.
- Evaluation. Your psychiatrist reviews your history, previous treatments, and medical background to confirm TMS is appropriate and safe for you.
- Mapping. At your first session, the team finds the right spot on your head and sets your treatment strength, based on how your brain responds to the pulses.
- Treatment sessions. You sit comfortably in a reclined chair with earplugs for hearing protection. The coil rests on your scalp and you hear clicking sounds and feel a tapping sensation. You stay awake and alert the whole time.
- Back to your day. There is no sedation, so you can drive yourself home and return to work, school, or normal activities right after each session.
Most people begin to notice improvement gradually, often in the second to fourth week. Many patients listen to music or a podcast during treatment.
How Effective Is TMS?
TMS has a strong evidence base for treatment-resistant depression. In clinical studies and real-world practice, roughly half to 60% of patients who complete a course see a meaningful improvement in symptoms, and about one in three reach full remission. These results are notable because they come from people who had already tried medication without enough benefit.
Results vary from person to person, and TMS is not a guaranteed cure. Some patients respond fully, some partially, and some not at all. For those who do improve, benefits can last months or longer, and some patients return for a brief maintenance course if symptoms come back.
The best outcomes often come when TMS is part of a broader plan that includes ongoing psychiatric care, therapy, healthy sleep, and exercise. Learn more about our depression treatment in Boston.
Is TMS Safe? Common Side Effects
TMS is considered safe and well tolerated. Unlike many medications, it does not cause weight gain, sexual side effects, or cognitive dulling, and it does not affect your memory.
The most common side effects are mild and tend to fade within the first week or two of treatment:
- Scalp discomfort or tingling where the coil rests
- Mild headache, usually relieved by over-the-counter pain medication
- Facial muscle twitching during the pulses
- Lightheadedness
The most serious risk is a seizure, which is rare. It occurs in well under 1 in 10,000 patients, and screening and treatment protocols are designed to keep that risk as low as possible. Your care team will review your history carefully before starting.
Who Should Not Have TMS?
Because TMS uses a magnetic field, it is not appropriate for people with certain metal or electronic implants in or near the head. These include:
- Aneurysm clips or coils
- Cochlear implants
- Deep brain stimulators or other implanted stimulators
- Metal fragments or shrapnel in or near the head
Dental fillings, braces, and most dental work are generally fine. A personal or strong family history of seizures, a prior head injury, or certain neurological conditions call for extra caution and a careful discussion with your psychiatrist. Always tell your care team about every implant, device, and medication, including supplements.
Does Insurance Cover TMS?
Many commercial insurance plans, along with Medicare, cover TMS for depression when certain criteria are met. Insurers typically ask that you have tried and not benefited from several antidepressant medications, and sometimes psychotherapy, before approving TMS. Coverage requirements differ by plan, and most require prior authorization.
Our team can review your history, help gather the documentation your insurer needs, and handle the authorization process with you. We recommend contacting your insurance company to confirm your benefits, and our office is happy to help you understand your out-of-pocket costs before you begin.
Frequently Asked Questions
Does TMS hurt?
Most patients describe a tapping sensation and mild scalp discomfort, which usually eases after the first week. Treatment strength can be adjusted for comfort.
Is TMS the same as ECT (electroconvulsive therapy)?
No. TMS does not cause a seizure, requires no anesthesia, and does not affect memory. You stay awake and can resume normal activities immediately.
Do I have to stop my medications?
Not usually. TMS is often used alongside current medication and therapy. Your psychiatrist will advise you on your specific plan.
Can I work or go to school during treatment?
Yes. Most people schedule sessions around work or school and go straight back to their day.
How long do the results last?
For many patients, improvement lasts for months or longer. If symptoms return, a repeat or maintenance course may be an option.
What if TMS doesn’t work for me?
It is not effective for everyone, but there are other options. Your psychiatrist can review alternatives, including medication changes, therapy, or other treatments such as Spravato (esketamine).
Is TMS Right for You?
Living with depression that hasn’t responded to treatment can feel discouraging, but it is not the end of the road. TMS offers a well-studied, medication-free option that many patients find life-changing.
The first step is a conversation. At Psych Boston, our psychiatrists will review your history, answer your questions, and help you decide whether TMS fits your goals. Contact our office or call 781-218-9550 to schedule a consultation.
This article is for general education and is not a substitute for professional medical advice, diagnosis, or treatment. If you are in crisis or having thoughts of harming yourself, call or text 988 (the Suicide & Crisis Lifeline) or go to your nearest emergency room.