When I discuss transcranial magnetic stimulation, or TMS, with a patient, I explain it as a noninvasive prescription treatment that uses repeated magnetic pulses to influence activity in targeted brain networks. It does not involve surgery or an implanted device. I also explain that TMS is not one universal treatment: devices, coil designs, targets, schedules, and FDA-cleared indications differ.
How I decide whether TMS belongs in the conversation
TMS may be considered for an eligible patient with a condition and treatment history that fit a specific protocol. It is often discussed after prior treatment has not provided enough benefit or has not been tolerated. FDA clearance is specific to the device, indication, age group, and protocol. Saying that a TMS device is “FDA cleared” does not mean every use of TMS is cleared for every diagnosis.
Before recommending TMS, I review the diagnosis, current episode, prior medication and psychotherapy, medical history, implanted metal or electronic devices, seizure history, sleep, substances, and medications that may affect risk. Insurance plans may also have their own authorization criteria.
What I tell patients to expect during a session
The patient remains awake and sits in a treatment chair. A treatment coil is positioned against the scalp, and the device delivers a prescribed series of magnetic pulses. Patients often describe tapping on the head and hear clicking from the equipment. Hearing protection may be used. The session length and total number of sessions depend on the device and protocol.
Routine TMS generally does not require anesthesia. Most patients can resume ordinary activities after an outpatient session, but individual instructions should come from the treating team.
Side effects and safety issues I review
Scalp discomfort, application-site pain, headache, facial muscle movement, lightheadedness, or tingling can occur. These effects may be more noticeable early in treatment. I want patients to report them because positioning, intensity, or other clinical adjustments may be appropriate.
Seizure is a rare but serious risk. I review seizure history, sleep deprivation, medications and substances that can affect seizure threshold, and other relevant factors. Metallic objects or implanted stimulators in or near the head may be contraindications or require device-specific review. Patients should disclose every implant, surgical clip, metal fragment, hearing device, and electronic medical device before treatment.
Questions I encourage patients to ask
- Which device and protocol would you use for me?
- Which FDA-cleared indication applies to that device and protocol?
- What prior treatments and records are required?
- Who performs the evaluation and supervises treatment?
- How are coil placement and treatment intensity determined?
- Which side effects should I report the same day?
- How will you measure symptoms and function?
- What is the plan if I miss sessions or do not improve?
How I assess progress
I do not judge progress from one good or bad day. I look at symptom rating scales, the patient’s report, functional goals, side effects, and the overall course. Improvement is not guaranteed, and response varies. The plan should include a defined reassessment point and a discussion of medication, psychotherapy, maintenance, or alternative care after the acute course.
Coverage and scheduling are part of planning
Coverage can vary by diagnosis, plan, device, prior treatment, and authorization criteria. Before starting, patients should ask the clinic to verify benefits and explain estimated responsibility, authorization status, the expected number of sessions, and missed-visit policies. A benefits check is not a guarantee of payment. Because attendance may be part of the prescribed course, transportation, work, school, and caregiving barriers should be discussed early.
What I do not want patients to assume
A response to TMS does not by itself confirm a diagnosis, and a lack of response does not mean symptoms are untreatable. TMS also does not automatically replace medication, psychotherapy, sleep care, substance-use treatment, or medical evaluation. Those decisions belong within the patient’s broader treatment plan.
TMS does not replace emergency care
TMS appointments are not a crisis service. Worsening depression, new suicidal thoughts, severe agitation, mania, psychosis, or another major change should be reported promptly and may require urgent evaluation. Call 911 for an emergency. For emotional distress or suicidal crisis, call or text 988.