Starting a new mental health treatment often brings up important questions. People considering transcranial magnetic stimulation (TMS) therapy usually want to know how the treatment works, what happens during visits, and whether it is safe.
TMS therapy is a non-invasive treatment provided by trained healthcare professionals using medical equipment designed to stimulate certain areas of the brain. Learning what to expect and how the treatment is delivered can help patients feel more prepared before beginning care.
This article explains how TMS therapy works, what patients may experience during treatment sessions, and important safety points to discuss with a licensed healthcare provider before starting therapy.
How Does TMS Therapy Work?
TMS therapy works by using magnetic pulses to stimulate underactive brain regions involved in mood regulation. A coil placed on the scalp generates brief, powerful magnetic fields that pass harmlessly through the skull, inducing small electrical currents in targeted neurons.
Mechanism
These currents depolarize nerve cells, temporarily increasing excitability in the dorsolateral prefrontal cortex (DLPFC)—often hypoactive in depression—triggering neurotransmitter release and synaptic strengthening.
High-frequency protocols (10 Hz+) create a “burst” of activity followed by modulation, while repeated sessions promote long-term potentiation for lasting circuit changes.
Treatment Targeting
Coil positioning uses the 5-cm rule or neuronavigation to hit the optimal DLPFC site, balancing left-side excitation with minimal deeper structure impact.
What Happens in the Brain During TMS Therapy?
Transcranial magnetic stimulation (TMS) therapy delivers targeted magnetic pulses to specific areas of the brain involved in mood regulation. These pulses pass through the skull and create small electrical currents in nearby nerve cells. In many treatment protocols, providers focus on the prefrontal cortex, a region that can show lower activity in some individuals with depression. Repeated stimulation over multiple sessions may help increase activity in these areas and support more balanced brain function.
Treatment is performed in a structured series because changes in brain activity typically develop gradually. Healthcare professionals monitor symptoms, side effects, and overall response throughout the treatment course to help ensure safe and appropriate care.
Key brain processes during TMS therapy may include:
- Neuronal activation
Magnetic pulses pass through the skull and cause nerve cells to generate electrical signals. This process can increase activity in brain regions responsible for mood, focus, and emotional control. - Targeting the prefrontal cortex
The treatment coil is positioned to stimulate a specific area of the brain often associated with depression symptoms. Precise placement helps deliver stimulation to the intended region while avoiding surrounding tissue. - Changes in brain connectivity over time
Repeated stimulation may influence how different brain regions communicate with each other. These adjustments can occur gradually over the course of treatment. - Consistent stimulation across sessions
TMS therapy is usually delivered several times per week for a defined period. Regular sessions help maintain consistent stimulation while providers evaluate progress and make adjustments if needed.
What patients may experience during treatment
- Scalp sensation during stimulation
Patients often feel a tapping or clicking sensation where the treatment coil touches the head. This feeling corresponds to the magnetic pulses being delivered. - Possible short-term side effects
Some individuals may experience mild headache, scalp discomfort, or temporary fatigue. These effects are generally manageable and often decrease as treatment continues. - Safety and risk considerations
TMS therapy is considered non-invasive and does not require anesthesia. Serious side effects are uncommon, although a very small risk of seizure has been reported. Providers review medical history and risk factors before treatment begins.
Why Multiple Sessions Are Needed for TMS Therapy?
Multiple TMS sessions are needed because brain changes occur gradually through neuroplasticity. TMS induces short-term neuronal firing, but sustained mood improvements require repeated stimulation to rewire underactive circuits in depression.
Neuroplasticity Timeline
Single sessions boost prefrontal cortex activity temporarily (minutes to hours), while daily treatments over 4–6 weeks strengthen synapses, release growth factors like BDNF, and normalize connectivity with limbic regions.
Cumulative Effects
Clinical protocols use 20–36 sessions (5x/week) as response rates reach 50–60% by week 4, with full benefits often emerging post-course; one session lacks lasting impact.
Monitoring Progress
Providers track symptoms weekly to adjust intensity or duration, ensuring safe cumulative dosing without tolerance buildup.
How Long TMS Therapy Takes to Work
Most patients begin to experience changes from TMS therapy within 2 to 4 weeks, which is roughly 10 to 20 treatment sessions. Stronger symptom improvement often develops toward the end of a standard treatment course, typically around 6 to 7 weeks, or about 30 to 36 sessions. Because TMS therapy is delivered repeatedly over time, progress usually occurs gradually rather than after a single session.
Typical timing during a standard TMS treatment course:
- Weeks 1–2 (First 5–10 sessions)
Patients are usually in the early stage of treatment. Some may experience small changes, such as improved sleep, slightly better energy, or subtle shifts in mood. - Weeks 3–4 (About 15–20 sessions)
Many patients begin to experience clearer changes in daily functioning, mood stability, or overall symptom control during this stage. - Weeks 6–7 (Around 30–36 sessions)
The majority of treatment response, when it occurs, is often seen near the completion of the full treatment schedule. - After the final session
For some individuals, improvement may continue for several weeks after treatment ends. In certain situations, providers may recommend follow-up visits or maintenance sessions based on the patient’s condition and clinical judgment.
Important note:
These timelines reflect common treatment schedules used in clinical practice. Individual response can vary, and a healthcare provider will monitor progress throughout treatment to ensure safe and appropriate care.
TMS Therapy Success Rate
Research suggests that transcranial magnetic stimulation (TMS) therapy can help many individuals with treatment-resistant depression. Some studies report that about 60% of patients who did not respond to other treatments may respond to standard TMS protocols, with a portion of patients maintaining improvement for several months after treatment.
Results vary for each person. A healthcare provider can evaluate individual factors and discuss expected outcomes based on medical history and treatment needs.
Have Questions About TMS Therapy? Our Team Is Here to Help
Deciding on a mental health treatment is an important step, and having clear information can make the process easier. If you are considering transcranial magnetic stimulation (TMS) therapy, a qualified provider can review your symptoms, medical history, and prior treatments to determine whether this option may be appropriate for your care plan.
At Texas 360 TMS, consultations are designed to help patients understand how treatment works, what to expect during sessions, and how progress is monitored over time. This discussion supports informed decisions based on professional medical guidance.
Call Texas 360 TMS at (512) 360-0805 to speak with our team or schedule a consultation at our Lakeway location.
