Transcranial magnetic stimulation (TMS) is a noninvasive treatment for depression, and clinics now offer it as an outpatient service. Since TMS requires no anesthesia or surgery, you stay awake and alert during each session. Here is more information on how the technology works so you know what to expect:
Delivering Magnetic Pulses
When a TMS session begins, a technician places a curved magnetic coil against your scalp. The coil sits near your forehead, slightly to the left side. An electric current flows through the coil, and the coil produces a brief magnetic field. Each pulse lasts a fraction of a millisecond.
The magnetic field passes through your skull without resistance, and it reaches the brain tissue below. Once the field reaches the brain, it creates a small electrical current in nearby nerve cells. This process follows a basic law of physics called electromagnetic induction.
Patients may notice a tapping sensation on the scalp. Some people feel mild discomfort or a headache, though these effects may fade after the first week. The machine makes a loud clicking sound, so you wear earplugs during treatment.
Stimulating Areas of the Brain
TMS targets the dorsolateral prefrontal cortex (DLPFC), and this region helps regulate mood and decision-making. Brain scans of people with depression often show low activity in this area. When magnetic pulses stimulate the DLPFC, the nerve cells there fire more often. Your provider locates this spot by measuring your motor threshold during the first visit.
Since the DLPFC connects to deeper brain structures, the effects spread beyond the stimulation site. One connected region is the limbic system, and it processes emotions and stress responses. Over time, repeated stimulation may strengthen communication between these networks.
Alleviating Depression Symptoms
Low DLPFC activity may be linked to several common depression symptoms. TMS aims to raise activity in this region over a series of sessions. Results vary between patients, and TMS does not help everyone. Your provider usually tracks these symptoms with a questionnaire before you start treatment:
- Persistent low mood or sadness
- Lost interest in daily activities
- Disturbed sleep, such as insomnia or oversleeping
- Low energy and trouble concentrating
- Lost appetite
Requiring Repeat Sessions
As brain changes build gradually, TMS works through a series of sessions rather than a single visit. A standard course runs for several weeks. Each session is short, and some newer protocols take only a few minutes. A typical session follows these steps:
- Check in and remove metal items, such as earrings or hair clips
- Sit in a reclined chair and insert earplugs
- Receive pulses while you rest, read, or talk
- Return to work, errands, or driving right after
Sessions require no recovery time, so many patients book appointments before work or during lunch. Some clinics offer early morning and evening time slots. If symptoms return later, your provider may suggest a shorter set of maintenance sessions.
Schedule TMS Therapy Near You
If you want to learn whether TMS fits your needs, start with a consultation at a licensed clinic. A trained provider reviews your medical history, and the team screens for metal implants or seizure risk. Bring a list of current medications and past depression treatments to your first visit. Contact a psychiatry clinic to book a consultation at a time that works for you.
