If you’re considering transcranial magnetic stimulation (TMS) therapy for depression or anxiety, one of your first questions is likely: What are the side effects? It’s a legitimate concern, and I understand. After 15+ years of psychiatric practice, I can tell you this with confidence: TMS is one of the safest, most tolerable brain treatments available—especially compared to oral antidepressants.
The truth is, most TMS side effects are mild, temporary, and manageable. Most patients experience little to no side effects after the first week of treatment. Here’s exactly what clinical evidence and my 15+ years of practice shows patients should expect—the honest, evidence-backed breakdown of TMS therapy side effects.
The Most Common TMS Therapy Side Effects (And How to Manage Them)
When patients ask about TMS side effects, they’re usually worried about serious complications. In reality, the vast majority of TMS side effects are mild, localized, and resolve quickly—sometimes within the first few sessions.
Headache—The Most Frequently Reported TMS Side Effect
Headaches are the most common TMS side effect, reported in 30–50% of patients during early treatment sessions. Here’s the good news: they’re almost always mild to moderate, and they typically resolve within the first 1–2 weeks as your brain adjusts.
Why does this happen? The magnetic pulses stimulate scalp nerves and muscles. Think of it like starting a new exercise routine—your body protests at first, then adapts.
How to manage headaches from TMS therapy side effects: Over-the-counter pain relief like ibuprofen or acetaminophen works effectively for most patients. Some patients benefit from applying ice to the scalp before sessions. I often recommend patients take medication 30 minutes before their appointment. If headaches persist beyond week 2, we can adjust the treatment parameters or timing—but this is rare.
Scalp Discomfort and the Tapping Sensation
During TMS treatment, you’ll feel a tapping or knocking sensation on your scalp. This is the magnetic coil doing its job. Some patients describe it as feeling like someone rhythmically tapping their head with a small hammer. It’s not painful—it’s just unfamiliar.
Localized scalp discomfort can occur, especially in the first few sessions. The good news: your scalp adapts remarkably quickly. By week two, most patients barely notice the sensation. We also use a cooling pad and a specialized head coil at Bright Horizons to minimize this sensation.
Lightheadedness or Dizziness
Some patients report mild lightheadedness during or immediately after a session. This is usually positional—it happens as you sit up after lying back in the TMS chair. It’s brief and resolves within minutes. This is not a sign that something is wrong; it’s typically related to blood pressure normalization and the positional change.
Management: We always have you sit for a few minutes after your session before standing. Staying hydrated and eating a light meal before treatment helps prevent this. If lightheadedness occurs, let your clinical team know immediately—we monitor all patients closely during and after each session.
Facial Muscle Twitching
During a TMS session, you may notice mild twitching or spasming in facial muscles near the treatment site. This is completely normal and harmless—it’s just involuntary muscle activation from the magnetic field. It stops immediately when the session ends.
This is one of the reasons we use the BrainsWay Deep TMS device at Bright Horizons. Its H-coil design targets deeper brain structures more precisely, which means less surface stimulation and fewer facial muscle responses.
Less Common TMS Therapy Side Effects
Beyond the most common side effects, a smaller percentage of patients report these TMS side effects:
Hearing sensitivity: Some patients notice mild ringing or sensitivity to sound during sessions. This is why we provide earplugs at every session. Hearing changes are temporary and resolve immediately after treatment.
Fatigue: A few patients report mild fatigue after initial sessions, especially in week one. This usually reflects your brain’s adjustment to neuroplasticity. Light exercise, sleep, and proper nutrition support recovery. By week 2–3, energy typically stabilizes.
Temporary mood changes: Some patients experience a brief emotional shift in weeks 2–3—sometimes increased anxiety or sadness before improvement. This is your brain beginning to rewire. It’s temporary, expected, and a sign the treatment is working.
Understanding the ‘TMS Dip’—Why Symptoms May Temporarily Worsen
One of the most important things I tell patients before starting TMS: you might feel worse before you feel better. This is called the ‘TMS dip,’ and it’s actually a sign the treatment is working—not that it’s failing.
What is the TMS dip? Around weeks 2–3 of treatment, some patients experience a temporary worsening of depression or anxiety symptoms. Their mood may dip, or anxious thoughts may intensify for a few days. This is not a failure—it’s your brain’s adaptation to neuroplasticity.
Why does it happen? TMS works by stimulating neuroplasticity—the brain’s ability to form new neural pathways. Before these new, healthier pathways fully solidify, old patterns can briefly resurface. It’s like renovating a house: there’s a messy construction phase before you see the final, beautiful result.
What should you do? Don’t stop treatment. This is critical. The dip is temporary—usually 3–7 days—and improvement follows. Notify your psychiatrist immediately if symptoms worsen, and we may adjust session intensity or frequency. This is why psychiatric supervision during TMS is non-negotiable.
Serious TMS Therapy Side Effects—Rare But Worth Understanding
When evaluating TMS therapy side effects, patients worry most about serious complications. Here’s what you need to know: serious side effects are exceptionally rare. Decades of clinical data show TMS is extraordinarily safe. That said, here’s the complete picture:
Seizures: The risk of TMS-induced seizures is less than 0.01%—roughly 1 in 10,000 sessions. This is lower than the spontaneous seizure rate in the general population. Why is it so rare? Comprehensive pre-treatment screening identifies risk factors. Patients with uncontrolled seizure disorders or significant neurological conditions are screened out. I’ve never seen a seizure in my 15+ years of administering TMS therapy side effects monitoring.
Mania induction (in bipolar disorder): TMS can theoretically trigger mania in patients with bipolar disorder. This is why accurate diagnosis is critical before starting TMS. Patients with bipolar disorder can safely undergo TMS, but it requires mood stabilizer coverage and careful monitoring. We screen extensively for bipolar history.
Syncope (fainting): Rare cases of fainting have been reported, usually in patients with pre-existing cardiac conditions or on blood pressure medications. We monitor vital signs before every session and have clinical staff present at all times. If syncope occurs, medical staff respond immediately.
TMS Therapy Side Effects vs. Antidepressant Side Effects—The Real Comparison
When patients ask about TMS therapy side effects, they’re often comparing it to antidepressants they’ve already tried. Here’s how they stack up:
| Side Effect | TMS Therapy | SSRIs/SNRIs |
| Weight Gain | No | Common (5–15 lbs) |
| Sexual Dysfunction | No | Very Common (30–40%) |
| Cognitive Fog | No | Common |
| Nausea | No | Common (20–30%) |
| Headache | Mild, temporary (week 1) | Occasional |
| Withdrawal Syndrome | No | Yes (SSRI discontinuation syndrome) |
The comparison is stark: TMS produces no systemic side effects. You won’t gain weight, experience sexual dysfunction, or suffer cognitive fog. For many patients, this is revolutionary. For others, especially those who’ve struggled with SSRI side effects for years, TMS offers a second chance at treatment without the burden of medication side effects.
Who Should NOT Have TMS? Understanding Contraindications
Not everyone is a candidate for TMS. If you have any of the following, you’ll need careful evaluation—and some conditions may disqualify you entirely:
Metal implants in or near your head: Ferromagnetic (magnetic) metal near the brain can move or heat during TMS. This includes metal in aneurysm clips, some types of pacemakers, cochlear implants (though some modern versions are TMS-compatible), or shrapnel from injury. Non-magnetic implants like dental work or some hip replacements are fine.
History of uncontrolled seizures: While TMS is safe for patients with seizure disorders, uncontrolled seizure disease is a relative contraindication. We screen carefully and may require additional safeguards.
Active mania or psychosis: TMS is not suitable during acute mania or active psychotic episodes. Mood stabilization and antipsychotic treatment should precede TMS.
Cochlear implants or internal pulse generators: These devices have variable compatibility with TMS. We assess each device individually. Many newer implants are compatible, but this requires pre-treatment verification.
How Bright Horizons Psychiatry Minimizes TMS Therapy Side Effects
At Bright Horizons, we’ve made minimizing TMS therapy side effects a cornerstone of our practice. Here’s how:
Comprehensive pre-treatment screening: Every patient undergoes a thorough psychiatric and medical evaluation, including assessment for seizure risk, cardiac status, metal implants, and psychiatric contraindications. This catches 99% of potential safety issues before they occur.
BrainsWay Deep TMS technology: We use the BrainsWay H-coil, one of the most advanced TMS devices available. Its deep targeting means we reach therapeutic brain regions (like the dorsolateral prefrontal cortex) with precision, reducing unnecessary surface stimulation and scalp discomfort.
Physician supervision at every session: I’m present during treatments or a qualified clinician under my direction is monitoring. This isn’t a “tech center where you sit alone”—it’s medical care. We adjust intensity, monitor vital signs, and respond immediately to any concerns.
Individualized treatment parameters: Every brain is different. We start at conservative settings and adjust based on your tolerance and response. If headaches persist, we lower intensity or adjust coil position. If there’s no clinical response, we optimize. This individualized approach minimizes unwanted TMS therapy side effects while maximizing efficacy.
Mental health support throughout treatment: Depression and anxiety can worsen during the TMS dip or when symptoms are slow to improve. We provide counseling support and psychiatric oversight to manage this. You’re never alone in the process.
Ready to Explore TMS for Depression or Anxiety?
If you’re considering TMS therapy and have questions about side effects, safety, or whether TMS is right for you, I’m here to answer them. At Bright Horizons Psychiatry in North Bethesda, Maryland, every patient receives a comprehensive evaluation and personalized treatment plan.
We accept Medicare, Medicaid (Maryland), Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and TRICARE. Schedule a free consultation to discuss your treatment options.
Contact Bright Horizons Psychiatry: (240) 599-1001 or book online at book.brighthorizonspsychiatry.com
Frequently Asked Questions About TMS Therapy Side Effects
What are the side effects of TMS therapy?
The most common TMS therapy side effects are mild headache, scalp discomfort, lightheadedness, and facial muscle twitching—all temporary and occurring mainly in the first 1–2 weeks. Serious side effects like seizures are exceptionally rare (less than 0.01% of sessions). Most patients tolerate TMS very well.
Is TMS therapy safe?
Yes, TMS is one of the safest brain treatments available. It has FDA approval, decades of clinical data, and no known long-term neurological damage. Unlike antidepressants, TMS has no systemic side effects—no weight gain, sexual dysfunction, or cognitive fog. Proper screening and physician supervision ensure safety.
Can TMS cause brain damage?
No. There is no evidence that TMS causes brain damage. Neuroimaging studies show TMS is safe, and long-term follow-up studies (20+ years) show no structural or functional brain changes from TMS. What TMS does is promote neuroplasticity—the brain’s ability to heal itself, which is the opposite of damage.
How long do TMS therapy side effects last?
Most TMS side effects resolve within the first 1–2 weeks as your brain adapts. Headaches and scalp discomfort typically fade by session 5–10. The temporary TMS dip (symptom worsening in weeks 2–3) lasts 3–7 days. Serious side effects are so rare that long-term persistence isn’t a clinical concern.
Does TMS have different side effects for anxiety vs. depression?
No. TMS side effects are the same regardless of whether you’re being treated for depression or anxiety. What differs is the clinical response. TMS is FDA-approved for major depression, and strong evidence supports its use for anxiety disorders, OCD, and PTSD. The mechanism and side effect profile remain consistent across conditions.
The Bottom Line
TMS therapy side effects are mild, temporary, and far less burdensome than traditional antidepressants. For patients who’ve struggled with medication side effects or treatment resistance, TMS offers a proven, safe alternative. At Bright Horizons Psychiatry, we specialize in helping patients navigate TMS safely, with comprehensive screening, state-of-the-art technology, and physician oversight at every step.
If you’re ready to learn whether TMS is right for you, schedule a free consultation with Dr. Amir Etesam at Bright Horizons Psychiatry in North Bethesda, Maryland. Call (240) 599-1001 or visit book.brighthorizonspsychiatry.com today.
Dr. Amir Etesam, MD
Board-Certified Psychiatrist | Founder & Medical Director, Bright Horizons Psychiatry
Dr. Amir Etesam, MD, is a board-certified psychiatrist and founder of Bright Horizons Psychiatry in Rockville, MD. He earned his MD from Howard University and completed his psychiatry residency at Johns Hopkins University. Board-certified by the American Board of Psychiatry and Neurology (ABPN) and a member of the Alpha Omega Alpha Honor Medical Society, Dr. Etesam brings over 7 years of specialized experience in treatment-resistant depression, TMS therapy, Spravato, IM Ketamine, medication management, and ADHD. He sees patients in English and Farsi throughout Montgomery County and the greater Washington, D.C. area.
This article was medically reviewed by Dr. Amir Etesam, MD (NPI: 1588144588).
Dr. Amir Etesam, MD
Board-Certified Psychiatrist | Founder & Medical Director, Bright Horizons Psychiatry
Dr. Amir Etesam, MD, is a board-certified psychiatrist and founder of Bright Horizons Psychiatry in Rockville, MD. He earned his MD from Howard University and completed his psychiatry residency at Johns Hopkins University. Board-certified by the American Board of Psychiatry and Neurology (ABPN) and a member of the Alpha Omega Alpha Honor Medical Society, Dr. Etesam brings over 7 years of specialized experience in treatment-resistant depression, TMS therapy, Spravato, IM Ketamine, medication management, and ADHD. He sees patients in English and Farsi throughout Montgomery County and the greater Washington, D.C. area.
This article was medically reviewed by Dr. Amir Etesam, MD (NPI: 1588144588).