TMS is a non-invasive option that can reduce symptoms or achieve remission for some people with major depression when medication or therapy has not helped enough.
Does TMS work for depression?
Transcranial magnetic stimulation (TMS) can help some people with major depressive disorder, particularly when antidepressant medicines, talking therapy or both have not brought enough improvement. It is not a guaranteed treatment, and it does not work in the same way or to the same extent for everyone.
TMS uses magnetic pulses applied to areas of the brain involved in mood regulation. It is a non-invasive treatment: no surgery is involved, and patients are awake during sessions. The US Food and Drug Administration first cleared TMS for major depressive disorder in 2008. It later cleared TMS for depression with comorbid anxiety in 2021.
When people ask whether TMS “works”, it is useful to look beyond a simple yes-or-no answer. Clinical research usually describes outcomes in terms of response and remission. These terms are related, but they do not mean the same thing.
What does “response” mean?
In TMS research, a response generally means a substantial improvement in depression symptoms from the start of treatment. Research studies commonly define this as symptoms reducing by about half on a recognised depression rating scale.
This can represent a meaningful change in daily life. Someone who responds may find that low mood is less persistent, sleep or appetite begins to improve, concentration becomes easier, or everyday tasks feel more manageable. They may also have more capacity to engage with work, family life, therapy or other aspects of their care.
However, a response does not necessarily mean that all symptoms have gone away. A person can improve significantly and still have some depression symptoms. For example, they may feel less hopeless and more active, while continuing to experience tiredness, reduced enjoyment or occasional low mood.
Response is therefore an important outcome, but it is not always the final goal.
What does “remission” mean?
Remission means that depression symptoms have reduced to a level considered minimal or absent on a clinical rating scale. In practical terms, it suggests that the person is no longer experiencing a current major depressive episode, or is experiencing very few remaining symptoms.
Remission is often the outcome patients and clinicians hope for, but it should not be confused with a permanent cure or a promise that depression will never return. Depression can recur, including after a successful course of TMS. Some people may need ongoing support through medication, psychological therapy, lifestyle changes, regular follow-up or a further course of treatment if symptoms return.
It is also possible for someone to reach remission gradually. Improvements may build over the course of treatment rather than appearing after the first few sessions.
What do published trials generally report?
Published TMS trials and clinical studies show that some people with depression experience a clinically meaningful improvement, and some reach remission. These results are especially relevant for people whose depression has not improved sufficiently with standard treatments.
The exact rates reported in trials vary. This is not simply because one study is “right” and another is “wrong”. Studies can differ in important ways, including:
- the severity and duration of participants’ depression
- how many treatments people had tried before TMS
- the TMS protocol used
- whether patients continued medication or therapy
- the rating scale used to measure symptoms
- how researchers defined response and remission
- whether outcomes were measured at the end of treatment or later on
For these reasons, a published result cannot tell an individual exactly what will happen for them. It can show that TMS is a reasonable evidence-based option for some people, but it cannot predict a personal outcome with certainty.
It is also worth remembering that trial participants are assessed in structured ways. In everyday clinical care, progress may be judged using both symptom questionnaires and wider changes, such as ability to function, return to routine, relationships, sleep and quality of life.
Why do individual TMS results vary?
Depression is not one identical illness with one identical cause. People arrive at TMS with different symptoms, histories, health needs and treatment experiences. That helps explain why outcomes differ.
Factors that may affect a person’s experience include the nature of their depression, how long symptoms have been present, whether there are other mental or physical health conditions, and whether they have had partial benefit from previous treatment.
Anxiety symptoms can matter too. Some people experience depression alongside anxiety, and their treatment plan may need to consider both. TMS has FDA clearance for depression with comorbid anxiety, but an assessment should still look carefully at the individual’s symptoms and diagnosis.
The treatment approach also matters. A typical course involves about 36 weekday sessions over roughly six to nine weeks, though the precise schedule depends on the clinical plan. Attending consistently can be important, as TMS is normally delivered as a course rather than a one-off treatment.
Clinicians may also review medication, therapy and other support during TMS. TMS is not always used in isolation. For some people, it forms one part of a broader plan for managing depression.
What if TMS does not lead to remission?
Not reaching remission does not mean there has been no value in treatment. A partial response can still be important if it reduces the intensity of symptoms or helps a person re-engage with daily life and other treatment.
Equally, it is reasonable to be honest if improvement is limited. A treating clinician should monitor symptoms throughout the course and discuss what the changes mean. This may include reviewing the diagnosis, treatment settings, other treatments, practical barriers to attendance or next-step options.
People considering TMS can ask how the clinic measures progress, how often results are reviewed, and what happens if symptoms do not improve as hoped. A clear answer is part of informed decision-making.
Safety and practical expectations
TMS is generally well tolerated, but it can cause side effects. The most common are scalp discomfort during treatment and headache afterwards. A seizure is rare, but it is a recognised risk and should be discussed during assessment.
A clinic should also review relevant medical history, medicines and factors that could affect suitability. TMS is not appropriate for every person, so an individual assessment is essential.
In Illinois, access may vary by location, insurer and the type of plan held. TMS Therapy Illinois lists 218 published clinics across the state, including clinics in Chicago, Rockford, Peoria, Naperville, Orland Park, Arlington Heights, Decatur, Plainfield, Springfield, Libertyville, Buffalo Grove and St. Charles.
Insurance arrangements differ between providers and plans. Carriers commonly seen in Illinois include Blue Cross Blue Shield of Illinois, Aetna, Cigna, UnitedHealthcare, Humana, Meridian / Illinois Medicaid, Medicare including Advantage plans, and TRICARE East. Coverage, referral requirements and prior authorisation should be checked directly with both the insurer and clinic.
Getting help in Illinois
Use the TMS Therapy Illinois clinic listings to find published providers, read the insurance guide before checking coverage, or use the contact page for help navigating the directory.
This article is educational information, not medical advice.
This page is informational and is not medical advice.