Transcranial Magnetic Stimulation Side Effects: A Closer Look at TMS Safety
What You'll Learn: Transcranial magnetic stimulation side effects are mild and localized for the vast majority of people. This article covers what's typical, what's rare, and how the side effect profile compares to standard psychiatric medications.
The Most Common TMS Side Effects
Most TMS side effects occur exactly where the magnetic coil touches your head. As the device activates, it produces a tapping or clicking sensation on your scalp.
Scalp discomfort is the most frequently reported side effect. You might feel a temporary soreness or tenderness at the exact stimulation site. This sensation usually fades shortly after the session ends.
Headaches are another potential reaction, particularly during the first few appointments. These are typically mild tension-type headaches caused by the repetitive tapping on the scalp muscles, and they generally respond well to standard over-the-counter pain relievers.
With standard TMS, some people experience light tingling, spasms, or twitching in the facial or jaw muscles during the delivery of magnetic pulses, caused by stimulation of superficial nerves. PrTMS uses a lower intensity than standard rTMS, which means these sensations are typically less pronounced. Facial and jaw twitching in particular are uncommon at the power levels used at Vancouver Brain Treatment Clinic.
You might also notice mild lightheadedness immediately following a session. Most people can drive themselves home or return to work without any issues.
The physical sensations of TMS decrease as your sessions progress. By the second week of treatment, the tapping will likely feel completely routine. Initial scalp tenderness or tension headaches become infrequent or disappear entirely.
How TMS Side Effects Compare to Medication
Psychiatric medications, such as antidepressants or anti-anxiety drugs, serve as the standard first-line treatment for many conditions.
While these medications save lives and provide necessary support, they act systemically, affecting your entire body rather than just the specific brain regions involved in your condition.
Some of the most common side effects of standard psychiatric medications include significant weight gain, chronic fatigue, nausea, insomnia, and sexual dysfunction. For many people, these issues become a barrier to continuing care. The medication might improve mood, but the resulting physical toll reduces overall quality of life.
Transcranial magnetic stimulation side effects differ because the treatment is entirely localized. The magnetic pulses target specific neural pathways a few centimetres within the brain tissue. They don’t enter your bloodstream or affect your body systemically.
Rare Side Effects of TMS
We always screen for rare but serious adverse events before treatment begins.
The most serious risk associated with TMS is seizure. The risk is extraordinarily low—clinical data indicate it occurs in less than 1% of standard TMS sessions, at a rate comparable to many common antidepressant medications.
Before you begin treatment, we conduct a thorough medical history review covering seizure disorders, epilepsy, traumatic brain injuries, and current medications (some drugs can lower your seizure threshold). If you have a history of seizures or have any metallic implants in your head or neck, we’ll recommend alternative treatments.
Managing Transcranial Magnetic Stimulation Side Effects
Your PrTMS technician remains in the room throughout every session. If you experience any discomfort, let them know. They can make adjustments to improve your experience without compromising the treatment.
Taking ibuprofen or acetaminophen about an hour before your appointment can help prevent tension headaches. Staying hydrated and eating beforehand can also reduce the likelihood of lightheadedness.
Is PrTMS Right for You?
For most people, the side effect profile of transcranial magnetic stimulation is mild, localized, and temporary. At Vancouver Brain Treatment Clinic, we take that a step further with PrTMS, a personalized approach that uses individual brain mapping to guide treatment rather than applying a one-size-fits-all protocol.
If you're weighing your options for treatment-resistant depression or another neurological condition, a consultation can clarify whether PrTMS is a reasonable next step.
Contact Vancouver Brain Treatment Clinic to schedule a consultation.