Transcranial magnetic stimulation (TMS) therapy has changed the way clinicians approach treatment-resistant depression and other mental health conditions. It uses gentle magnetic pulses to “wake up” parts of the brain that control mood. It’s safe, doesn’t involve surgery or added medications, and can help people feel better when other treatments haven’t worked.
TMS side effects are mild and usually temporary, and understanding what to expect before starting treatment can help patients feel more comfortable and confident in their decision to pursue TMS therapy.
Understanding transcranial magnetic stimulation (TMS)
TMS is a non-surgical procedure that uses targeted magnetic fields to activate nerve cells in the parts of the brain that control mood. It is approved by the US Food and Drug Administration for the treatment of major depressive disorder (MDD), treatment-resistant depression, anxious depression, obsessive-compulsive disorder (OCD), and smoking cessation.
TMS provides a valuable alternative for people who don’t respond to antidepressants or prefer to avoid medications. Compared to electroconvulsive therapy (ECT), TMS does not require anesthesia and carries significantly fewer side effects, making it an appealing option for long-term management of depression and related conditions.
History and development of TMS
TMS dates back to the 1980s, when researchers first explored how magnetic fields could influence brain activity. Early devices were large and limited in capability, but technology has since advanced dramatically.
Today’s TMS systems are highly precise, allowing clinicians to target specific brain regions with individualized treatment parameters.
Beyond depression, researchers have explored TMS for conditions such as OCD, bipolar disorder, and anxiety, expanding its role in modern psychiatric care.
How TMS works
TMS works by sending short magnetic pulses through a coil placed against the scalp. It creates gentle electrical currents in targeted areas of the brain, typically the front part of the brain, a region linked to mood regulation.
These currents activate neurons and help normalize activity patterns associated with depression. Over time, this repeated stimulation helps improve communication between brain regions and may support long-term mood stabilization.
Treatment usually involves 36 sessions over nine weeks, with each session lasting about 20 minutes. Shorter protocols, like theta burst stimulation (also called Express TMS) can deliver the same therapeutic benefit in as little as three minutes.
TMS therapy treatment
TMS therapy is performed in a comfortable outpatient setting by trained healthcare professionals. Because it is noninvasive, patients can remain awake and resume their normal activities immediately after each session.
Many individuals receive TMS alongside other forms of treatment, such as medication management and psychotherapy, to support overall mental health recovery. This integrative approach allows providers to address both biological and psychological aspects of depression.
Research shows that 3 out of 5 patients who underwent TMS treatment experience significant improvement in their symptoms. About one-third achieve full remission, meaning their symptoms go away entirely.
Common TMS side effects
TMS is considered safe and well-tolerated, with most side effects being mild and temporary. The most common include:
- Scalp discomfort at the treatment site
- Headache or facial muscle twitching
- Mild fatigue after sessions
- Jaw or eye discomfort
- Temporary sleep changes, such as mild insomnia
These side effects typically lessen as the body adjusts to treatment, often improving after the first week. Over-the-counter pain relief and minor adjustments to stimulation settings can further minimize discomfort.
Serious TMS side effects
Serious side effects are extremely rare. However, it’s important to be aware of them and communicate any changes to a provider. Potential but uncommon risks include:
- Seizure (estimated risk: less than 0.1%)
- Worsening of depressive symptoms or increased suicidal thoughts
- Temporary hearing sensitivity if ear protection is not used
- Malfunction of implanted devices such as cochlear implants or pacemakers
Most serious complications are preventable through careful screening and professional supervision. Providers always review a patient’s medical history to ensure TMS is appropriate and safe before beginning treatment.
Risk factors and contraindications
Certain medical conditions may increase the risk of side effects from TMS. TMS may not be suitable for individuals who:
- Have a history of epilepsy or seizure disorders
- Use implanted medical devices (e.g., pacemakers, vagus nerve stimulators, or cochlear implants)
- Have experienced a recent traumatic brain injury
- Are pregnant or have other medical complexities requiring special precautions
A thorough consultation and screening process helps providers determine whether TMS is a good fit and how to tailor treatment for maximum safety and benefit.
Minimizing TMS side effects
Several strategies can help reduce or prevent side effects during TMS therapy:
- Follow treatment instructions: Consistency helps the brain adapt and respond effectively.
- Communicate openly: Inform your provider of any discomfort or changes in mood so they can adjust the stimulation level or coil placement.
- Protect your hearing: Always wear earplugs during sessions to reduce exposure to the clicking sound of the magnetic pulses.
- Stay hydrated and rest well: Fatigue or mild headaches can improve with proper rest and hydration.
- Discuss medication use: Certain medications can influence seizure threshold, so providers may adjust prescriptions as needed.
These proactive steps ensure that treatment remains both safe and comfortable throughout the process.
When to seek help for side effects
Although TMS is widely recognized for its safety, patients should contact their healthcare provider if they experience:
- Persistent headaches that worsen over time
- Significant mood changes or new suicidal thoughts
- Muscle twitching or discomfort that interferes with daily life
- Unusual neurological symptoms (e.g., confusion or dizziness)
Seeking prompt guidance helps ensure that side effects are properly managed and that treatment continues safely.
TMS’ role in comprehensive care
TMS is often one component of a broader mental health plan meant to address multiple aspects of mental health.
Collaborating with a provider experienced in interventional psychiatry allows patients to explore these options safely and build a plan that aligns with their goals and comfort level.
Summary
Transcranial magnetic stimulation is one of the safest and most effective treatments available for individuals with depression who haven’t responded to traditional approaches. While mild side effects such as scalp discomfort or headaches can occur, they usually resolve quickly and rarely interfere with daily life.
By understanding potential side effects and maintaining open communication with their provider, patients can feel confident in pursuing TMS therapy as part of a comprehensive path toward mental wellness.
Key takeaways
- TMS therapy is safe and noninvasive, with most side effects being mild and short-lived.
- Serious side effects are extremely rare and can be minimized through proper screening and monitoring.
- Common discomforts such as headaches or scalp tenderness typically fade as treatment progresses.
- Clear communication with a provider helps ensure adjustments can be made for comfort and safety.
- TMS can be combined with treatments like Spravato, medication management, and therapy for comprehensive care.
Looking for TMS treatment near you?
Pacific Mind Health offers transcranial magnetic stimulation (TMS) for depression, OCD, and other mental health conditions. Our experienced clinicians provide compassionate, evidence-based care to help you feel better.
Ready to take the next step? Schedule a free consultation today to see if TMS is right for you.
