Transcranial Magnetic Stimulation (TMS) therapy is widely recognized as a highly effective, remarkably safe, and exceptionally well-tolerated treatment for severe depression and various other mental health conditions.
Unlike systemic treatments such as traditional oral antidepressant medications, which circulate throughout the entire body and can cause a wide array of widespread side effects, TMS is a targeted, localized treatment.
This essential distinction means the side effects associated with TMS are typically minimal, temporary, and confined solely to the area of stimulation on the head.
The Localized Nature of TMS: Why It Matters
To truly understand the side effect profile of TMS, one must first understand how the technology works.
During a session, a specialized magnetic coil is placed gently against your scalp. It targets the area of the brain known to be underactive in individuals suffering from Major Depressive Disorder (MDD). Read more about this mechanism on our How TMS Works page.
Because the magnetic field only reaches a few centimeters into the skull, it stimulates the targeted brain tissue without systematically affecting the rest of your body's organs.
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Schedule Your Free CallBreaking Down the 5 Most Common Side Effects
1. Scalp Discomfort or Mild Pain
The most common side effect reported by patients is mild to moderate scalp discomfort at the treatment site.
Because TMS uses magnetic pulses to stimulate nerve cells, the muscles and tissues in the scalp also receive some residual stimulation.
- What to expect: You will feel a tapping or clicking sensation on your head. For sensitive scalps, this can cause temporary discomfort during the first few minutes.
- How it's managed: This discomfort typically lessens significantly after the first week due to habituation. Our technicians can also make micro-adjustments to the coil position to maximize your comfort.
2. Tension Headaches
Headaches are another very frequently reported, yet highly manageable, side effect of TMS therapy.
Clinical data suggests that roughly half of all patients will experience a mild headache following a treatment session, particularly during the first week.
- What to expect: These headaches mimic a standard tension headache rather than a migraine. They usually begin shortly after the session ends.
- How it's managed: Over-the-counter pain medication (like ibuprofen) is typically sufficient. Drinking water and applying a warm compress to the neck also provide significant relief.
3. Facial Muscle Twitching
The magnetic pulses inevitably stimulate the superficial nerves located in the scalp and face.
This can occasionally cause temporary tingling, spasms, or involuntary twitching of the facial muscles.
- What to expect: You might notice a slight, rhythmic twitch in your jaw or eyebrow that corresponds with the tapping of the machine.
- How it's managed: This is harmless and stops the moment the machine turns off. If it is uncomfortable, your technician can adjust the coil placement slightly.
4. Mild Lightheadedness
A small percentage of patients report feeling lightheaded or dizzy during or immediately following a session.
This is often a physiological response to the new sensation or minor anxiety about the procedure.
- What to expect: This sensation is usually brief, mild in nature, and resolves entirely on its own within a few minutes.
- How it's managed: We encourage patients to remain seated until they feel grounded. Having a light snack before your appointment can also help prevent dizziness.
5. Temporary Alterations in Hearing
The TMS machine generates a loud clicking noise during operation.
Because the coil is placed near the ear, this acoustic noise can be quite loud without protection.
- What to expect: Without protection, you might experience temporary ringing in the ears or muffled hearing.
- How it's managed: We provide high-quality earplugs for every single session. You are also welcome to listen to music through earbuds to block out the sound.
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Learn More About NeuroStarRare but Serious Risks: The Risk of Seizures
While extremely rare, the most serious potential side effect of TMS therapy is the induction of a generalized seizure.
The overall risk is estimated to be less than 0.1% per treatment course. This risk is actually lower than or comparable to the risk associated with some oral antidepressants.
To eliminate this risk, our psychiatric providers conduct a rigorous medical history review before approving you for treatment. Individuals with a history of epilepsy or traumatic brain injuries may not be candidates.
What TMS Does NOT Cause (Myth Busting)
It is equally important to highlight what TMS therapy definitively does NOT cause.
Because it involves the brain and magnets, it is sometimes incorrectly confused with Electroconvulsive Therapy (ECT). Unlike ECT or systemic medications, TMS does NOT involve:
✗ No Anesthesia
You are wide awake, alert, and able to converse with the technician throughout the entire session.
✗ No Memory Loss
Numerous studies show that TMS does not negatively impact memory or cognitive concentration.
✗ No Systemic Issues
TMS does not cause weight gain, dry mouth, upset stomach, or sexual dysfunction.
✗ No Recovery Period
There is no downtime. You can drive yourself to your appointment and drive directly back to work.
Conclusion: A Favorable Risk-to-Benefit Ratio
When evaluating any medical treatment, it comes down to the risk-to-benefit ratio.
For the vast majority of patients suffering from severe depression, the side effects of TMS therapy are mild, temporary, and easily managed. When weighed against the immense potential benefits, the minor discomforts are a very small price to pay.
Frequently Asked Questions About TMS Side Effects
Will TMS therapy change my personality?
No, TMS will not change who you are. The magnetic pulses are specifically targeted to stimulate the areas of the brain involved in mood regulation. While patients often report feeling "more like themselves again" as their depression lifts, their fundamental personality, beliefs, and intellect remain completely unchanged.
Does TMS therapy cause brain damage or tumors?
Absolutely not. The magnetic energy used in TMS is identical in type and strength to the magnetic fields used in MRI machines, which have been used safely in medicine for decades. There is zero evidence linking TMS therapy to brain damage, cellular degradation, or the development of tumors.
Is it safe to have TMS if I have metal in my body?
This depends on the location of the metal. If you have magnetic-sensitive metal implants in or near your head or neck (such as aneurysm clips, cochlear implants, or bullet fragments), you are not a candidate for TMS due to safety risks. However, dental fillings, braces, or metal implants in other parts of the body (like a knee replacement) are perfectly safe.
Can I stop taking my antidepressants once I start TMS?
You should never abruptly stop taking prescribed antidepressants without the direct supervision of your psychiatrist. Most patients actually continue their current medication regimen throughout their TMS course. As you improve, your doctor may work with you to safely taper your medications if appropriate.
How will I feel immediately after a session?
Most patients feel completely normal and alert immediately following a session. You might experience a mild headache or slight scalp tenderness, but you will not feel groggy, sedated, or impaired in any way. You can instantly resume driving, working, or socializing.
Are the effects of TMS permanent?
Depression is a chronic condition, and while TMS offers long-lasting relief for many, it is not considered a permanent "cure." Many patients enjoy remission for a year or much longer. If symptoms eventually return, a shorter course of "maintenance" or "booster" TMS sessions is often highly effective in restoring mood.