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.
TMS therapy side effects are mild and local. That is not marketing. It is what 15+ years of clinical data shows. 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 (50-60%)
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.
As we covered in our what TMS feels like guide, pain ratings at session 1 average 4.2/10. By session 5, that drops to 2.8/10. By session 20, it is down to 1.1/10.
Headache after treatment (20-30%)
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 (5-10%)
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
Seizure (<0.1%)
This is the one that scares people, so let us be direct. The risk of seizure during TMS is about 1 in 30,000 sessions. That is comparable to or lower than the seizure risk from many antidepressants. 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. There are no reports of permanent hearing damage when ear protection is worn.
What TMS Does NOT Cause
This is where TMS really stands apart from medication:
- No weight gain (unlike SSRIs, SNRIs, mood stabilizers)
- No sexual dysfunction (unlike nearly every antidepressant)
- 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 personality changes
As we covered in our does TMS cause memory loss guide, the research is clear. TMS has no measurable negative effect on memory or cognitive function.
Side Effects Comparison
TMS has one of the cleanest side effect profiles in psychiatry. Here is how it compares to other depression treatments:
| Side Effect | TMS | Antidepressants | ECT |
|---|---|---|---|
| Scalp discomfort / headache | Common, mild | None | None |
| Weight gain | None | Common (25-40%) | None |
| Sexual dysfunction | None | Very common (40-65%) | None |
| Memory loss | None | Rare | Common, temporary |
| Withdrawal | None | Common (up to 50%) | None |
| Cognitive dulling | None | Common | None |
| 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 (50-60%) and headache (20-30%) are most common.
- Side effects fade quickly. Most people barely notice discomfort by week two.
- Seizure risk is about 1 in 30,000 sessions, comparable to or lower than many antidepressants.
- 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?
About 20-30% of people get a mild headache after TMS sessions. It is typically like a tension headache and responds well to over-the-counter pain relievers like Tylenol or Advil. Headaches are most common in the first week and usually stop happening after that.
Does TMS cause weight gain?
No. TMS does not cause weight gain. That is one of its major advantages over antidepressants, where 25-40% of patients experience significant weight gain.
Does TMS cause sexual side effects?
No. TMS does not cause sexual dysfunction. That is a major advantage over antidepressants, where 40-65% of patients experience reduced libido, difficulty with arousal, or difficulty with orgasm.
Is TMS painful?
The first session is the most uncomfortable. Most people describe it as a tapping or knocking sensation on the scalp. Pain ratings average 4.2/10 at session 1 and drop to 1.1/10 by session 20. By week two, most people barely notice it. Your technician can adjust the coil position to improve comfort.
Can TMS cause a seizure?
The risk is about 1 in 30,000 sessions, which is comparable to or lower than many antidepressants. Clinics screen for seizure risk factors before starting treatment. If you have a history of epilepsy or seizures, tell your provider before starting TMS.
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