How does TMS work? Learn 7 powerful facts about TMS therapy, including how magnetic pulses stimulate the brain, and what to expect.
Transcranial Magnetic Stimulation is a noninvasive form of brain stimulation. Instead of introducing medication into the bloodstream or using a surgical procedure, TMS uses a treatment coil positioned against the scalp.
The coil generates rapidly changing magnetic fields. These magnetic fields pass through the scalp and skull and induce small electrical currents in the targeted area of the brain.
That distinction matters. TMS doesn’t require an incision, and the treatment doesn’t involve placing an electrode inside the brain.
NeuroStar describes its system as an in-office, non-drug treatment that uses targeted magnetic pulses to stimulate nerve cells in areas involved in mood regulation.
For patients, the practical experience is relatively straightforward: you sit in a treatment chair, the coil is positioned on your head, and the prescribed stimulation is delivered while you remain awake.
Understanding how TMS works also means understanding how the magnetic field reaches the brain without surgery.
This is where TMS becomes more interesting. The brain communicates through networks of nerve cells. Those networks help regulate processes such as mood, attention, movement, memory, and behavior.
In depression, researchers have identified differences in activity and connectivity across brain networks involved in mood regulation. TMS is designed to influence activity in specific brain regions and the networks connected to them.
During treatment, the magnetic coil delivers repeated pulses to the targeted area. Those pulses induce electrical activity in the underlying brain tissue.
The purpose isn’t simply to “turn the brain on.” It’s more precise than that.
The stimulation is delivered according to a specific protocol designed for the condition being treated. With repeated treatments, the goal is to produce changes in neural activity that may contribute to improvement in symptoms.
The precise biological mechanisms behind the clinical effects of TMS are still being studied. Researchers continue to investigate how stimulation affects neural circuits, neurotransmitter systems, and brain connectivity.
So while we understand the basic physics of TMS quite well, the full story of why TMS produces lasting clinical improvement in some patients is more complicated.
That distinction is important when discussing any brain-based treatment.
You might reasonably wonder: If the brain is protected by the skull, how can a device sitting on the scalp affect it?
The answer is ‘electromagnetic induction’.
The magnetic field produced by the TMS coil can pass through the scalp and skull. When the magnetic field changes rapidly, it induces a small electrical current in the underlying brain tissue.
The process doesn’t require the coil to touch the brain. Instead, the coil is positioned carefully over the intended treatment area.
NeuroStar uses a targeted treatment coil and positioning technology designed to consistently deliver the prescribed stimulation to the treatment location. This is one reason TMS is classified as noninvasive.
TMS can influence the excitability of neurons in the targeted area.
Depending on the stimulation protocol, TMS can increase or decrease neural excitability. However, it would be misleading to reduce the treatment of different conditions to a simple “excitation versus inhibition” formula.
The brain doesn’t work like an isolated switch. Stimulating one region can influence connected networks, which is one reason researchers study TMS in terms of brain circuits and connectivity rather than only individual neurons.
For depression, NeuroStar targets a region associated with mood regulation as part of its prescribed treatment protocol.
Repeated stimulation may produce changes that continue beyond the individual treatment session. Researchers have associated these longer-term effects with changes in neural plasticity and network function, although the precise biological mechanisms remain an active area of research.
In practical terms, the important point for patients is this: TMS is intended to influence brain activity through repeated, targeted stimulation not simply provide a temporary sensation during each appointment.
TMS isn’t typically a one-and-done treatment. That’s because the therapeutic goal involves repeated stimulation over time.
A single session delivers magnetic pulses to the targeted area, but a treatment course involves repeated sessions according to a prescribed schedule.
For NeuroStar depression treatment, sessions may take as little as 19 minutes, depending on the protocol. NeuroStar’s patient materials describe treatment schedules that commonly involve five sessions per week over approximately four to six weeks, although the exact schedule can vary according to the clinician’s recommendation.
This is also why completing the prescribed treatment course matters. You shouldn’t interpret one difficult day, one unusually good day, or one early session as the final result of treatment.
Your clinician monitors your progress throughout the course and determines how your treatment should proceed.
For depression, NeuroStar uses targeted magnetic stimulation to influence an area of the brain involved in mood regulation.
The treatment doesn’t involve medication entering the bloodstream. Instead, the coil delivers magnetic pulses to the targeted region while you remain awake and alert.
The clinical goal is to reduce depressive symptoms and improve functioning. Results vary between individuals, and TMS isn’t guaranteed to work for everyone.
That last point matters. Healthcare decisions shouldn’t be based on the assumption that a treatment will produce the same outcome for every patient.
A proper evaluation considers your symptoms, treatment history, medical history, and whether the treatment is appropriate for you.
The actual process is less intimidating for many people than the terminology makes it sound. You’ll sit or recline in a treatment chair while the clinician positions the TMS coil against your scalp.
Once the treatment parameters have been established, the device delivers magnetic pulses to the targeted area. You remain awake. You don’t need general anesthesia or sedation.
You may hear clicking sounds and feel a tapping or pulsing sensation on your scalp while the magnetic stimulation is delivered.
After the session, NeuroStar states that patients can resume normal activities immediately because the treatment does not impair alertness.
The exact duration depends on the protocol being used. For NeuroStar, treatment sessions can take as little as approximately 19 minutes, while other protocols may take longer.
TMS isn’t generally described as a painful procedure, but it can cause temporary discomfort.
During treatment, you may feel tapping, tingling, pressure, or warmth where the coil is positioned.
NeuroStar identifies pain or discomfort at or near the treatment site as its most common side effect. These effects are generally temporary and do not occur for most patients after the first week of treatment.
If the stimulation becomes uncomfortable, tell your treatment provider. You don’t need to quietly tolerate significant discomfort. Your clinician can assess your response and determine whether adjustments are appropriate.
For a more detailed explanation of what NeuroStar treatment feels like, patients can also read our guide on whether NeuroStar TMS treatments hurt.
No. TMS and electroconvulsive therapy (ECT) are different treatments.
TMS uses magnetic pulses to stimulate targeted areas of the brain while the patient remains awake. It does not require general anesthesia or induce a therapeutic seizure.
ECT, by contrast, uses a controlled electrical stimulus under anesthesia to intentionally produce a therapeutic seizure. Both are legitimate medical treatments, but they are not interchangeable.
If you’re deciding between treatment options for depression, a qualified mental health professional can explain which approaches may be appropriate based on your individual circumstances.
TMS uses rapidly changing magnetic fields to induce small electrical currents in targeted areas of the brain. The stimulation can influence neural activity and connected brain networks. NeuroStar uses targeted magnetic stimulation of areas involved in mood regulation when treating depression.
TMS is generally delivered as a course of repeated treatments rather than as a one-time intervention. Some patients may notice changes during the treatment course, but the timing and degree of improvement vary between individuals.
NeuroStar states that its treatment can take as little as approximately 19 minutes per session, depending on the treatment protocol.
Yes. You may feel tapping, pulsing, tingling, pressure, or warmth near the treatment coil. Some patients experience temporary discomfort.
Yes. NeuroStar treatment is delivered while patients are awake and alert, without general anesthesia or sedation.
The number and frequency of sessions depend on the treatment protocol and your clinician’s recommendation. NeuroStar materials describe depression treatment courses that commonly involve five sessions per week for approximately four to six weeks, but individual treatment plans can vary.
NeuroStar Advanced Therapy is indicated as an adjunctive treatment for adult patients with OCD. Whether it is appropriate for you requires an evaluation by a qualified healthcare professional.
TMS is considered a noninvasive treatment, but it is not completely risk-free. NeuroStar identifies pain or discomfort at or near the treatment site as its most common side effect and reports a rare risk of seizure associated with TMS therapy. Your provider should review the safety information and screen you before treatment.
Understanding how TMS works can make the treatment feel much less mysterious. A coil placed against the scalp delivers rapidly changing magnetic pulses that induce small electrical currents in a targeted region of the brain.
Knowing deeply how TMS works can make it easier to have an informed conversation with your provider.
With repeated sessions, the treatment is intended to influence neural activity and the brain networks involved in conditions such as major depressive disorder. But TMS isn’t a universal solution, and the right treatment depends on the individual.
If you’re considering TMS, understanding how TMS works is a good starting point, but deciding whether it is appropriate for you requires an individual assessment. A qualified healthcare professional can review your symptoms, medical history, current treatments, and treatment goals before recommending the next step.
