Everything you need to know about TMS Side Effects: What Actually Happens (and What Does Not) — how it works, what it costs, and how to find a provider who actually knows what they're doing.
Still have questions? Get the full Buyer's Guide.
A free 22-page primer answering every common question about TMS therapy.
TMS therapy side effects are mild and local. That is consistent with what clinical trials and FDA labeling show. The most common complaint is scalp discomfort at the treatment site during the first few sessions. It fades as you get used to it.
This guide gives you the honest rundown of what TMS does and does not do to your body.
What You’ll Learn
- What side effects TMS actually causes and how common they are
- The rare risks worth knowing about
- What TMS does not cause (a long list of things antidepressants do)
- When to contact your provider
What Most People Experience
Scalp discomfort or pain at the treatment site (the most common side effect)
This is the big one. The magnetic coil tapping against your scalp feels strange at first. Some describe it as a woodpecker. Others describe it as a rubber band snapping. It ranges from mildly annoying to genuinely uncomfortable during the first 3-5 sessions.
The good news: your scalp adapts. By week two, most people barely notice it. Your technician can also adjust the coil position and intensity to dial down the discomfort.
See our what TMS feels like guide for more on how the sensation changes over a course.
Headache after treatment
Typically mild, similar to a tension headache. It responds to over-the-counter pain relief, Tylenol or Advil, taken after your session. These usually stop happening after the first week.
Lightheadedness
Some people feel briefly lightheaded after a session. It passes within minutes. If this happens to you, sit for a few minutes before standing up.
What Almost Never Happens
This is the one that scares people, so let us be direct. The risk of seizure during TMS is on the order of 1 in 30,000 sessions according to FDA labeling. Clinics screen for seizure risk factors before starting treatment.
Hearing changes
TMS devices are loud. The clicking sound is significant. Clinics provide earplugs. Use them. Permanent hearing damage has not been a reported problem when ear protection is worn.
What TMS Does NOT Cause
This is where TMS really stands apart from medication:
- No weight gain (which can occur with some antidepressants and mood stabilizers)
- No sexual dysfunction (which can occur with many antidepressants)
- No drowsiness or brain fog (unlike benzodiazepines, some SSRIs)
- No GI problems (unlike SSRIs in the first weeks)
- No withdrawal symptoms when treatment ends
- No memory loss (unlike ECT)
- No known personality changes
As we covered in our does TMS cause memory loss guide, trials have not found a pattern of memory or cognitive harm from TMS.
Side Effects Comparison
TMS has a generally mild side effect profile. Here is how it compares in general terms to other depression treatments:
| Side Effect | TMS | Antidepressants | ECT |
|---|---|---|---|
| Scalp discomfort / headache | Common, mild | Headache can occur | Headache common after treatment |
| Weight gain | Not reported | Can occur with some | Not typical |
| Sexual dysfunction | Not reported | Common with some | Not typical |
| Memory loss | Not reported | Uncommon | Can occur, often temporary |
| Withdrawal | None | Can occur when stopping | None |
| Cognitive dulling | Not reported | Can occur with some | Can occur |
| Requires anesthesia | No | No | Yes |
When to Tell Your Provider
Contact your TMS clinic if you experience:
- A headache that does not respond to OTC pain relief
- Any involuntary muscle movements during treatment
- Changes in hearing after a session
- Worsening of depression symptoms (rare but possible during the adjustment period)
Key Takeaways
- TMS side effects are mild and local. Scalp discomfort and headache are the most common.
- Side effects fade quickly. Most people barely notice discomfort by week two.
- Seizure risk is on the order of 1 in 30,000 sessions according to FDA labeling.
- TMS causes no weight gain, no sexual dysfunction, no memory loss, no withdrawal.
- Use earplugs during treatment. There are no hearing damage reports when protection is worn.
- Contact your provider if headache does not respond to OTC meds, or if you notice hearing changes.
Frequently Asked Questions
Does TMS cause headaches?
Headache after sessions is common but usually mild, similar to a tension headache, and it typically responds to over-the-counter pain relievers. Headaches are most common in the first week and usually lessen after that.
Does TMS cause weight gain?
TMS is not associated with weight gain, which can occur with some antidepressants.
Does TMS cause sexual side effects?
TMS is not associated with sexual dysfunction, which can occur with many antidepressants.
Is TMS painful?
The first sessions are usually the most uncomfortable. Most people describe a tapping or knocking sensation on the scalp, and many find it easier to tolerate after the first week. Your technician can adjust the coil position to improve comfort.
Can TMS cause a seizure?
The risk is on the order of 1 in 30,000 sessions according to FDA labeling. Clinics screen for seizure risk factors before starting treatment. If you have a history of epilepsy or seizures, tell your provider before starting TMS.
Ready to Explore Your TMS Options?
Browse verified TMS providers, read real reviews, and find the right treatment for your situation.
Related reading
- TMS for Multiple Sclerosis: Addressing Fatigue, Depression, and Cognitive Impairment
- TMS vs ECT: Comparing Brain Stimulation Treatments
- TMS vs ECT: Which Brain Stimulation Treatment Is Right for You?
- What TMS Actually Feels Like: A Session-by-Session Guide
- How to Prepare for Your First TMS Session
- Take the TMS candidacy quiz
