Transcranial Magnetic Stimulation (TMS) is a non-invasive, FDA-cleared treatment for depression and other mental health conditions. It is generally well-tolerated, but like any medical treatment, it may cause some side effects — most of which are mild, temporary, and improve over time.
Common Side Effects of TMS
The majority of TMS patients experience little to no discomfort. However, some may notice the following common side effects:
Mild Headaches
- These are the most frequently reported side effects, especially during the first few sessions.
- Headaches usually decrease as treatment progresses.
Scalp Discomfort or Tingling at the Treatment Site
- Some patients describe a tapping or tingling sensation on the scalp where the coil is placed.
- The sensation is usually brief and fades quickly after each session.
Facial Muscle Twitching or Eye Blinking
- The magnetic pulses can sometimes stimulate nearby facial nerves, causing brief, harmless muscle twitches.
- This effect is typically mild and reduces with time.
Lightheadedness or Dizziness
- A small number of patients feel slightly dizzy during or right after treatment.
- This usually resolves quickly without medical intervention.
Less Common but Serious Side Effects
Although rare, there are a few more serious side effects to be aware of:
- Seizures: Extremely rare (estimated at less than 0.1%), mostly in individuals with a history of seizures or certain neurological conditions.
- Hearing Discomfort: TMS machines make a clicking noise; earplugs are provided to protect hearing during sessions.
Is TMS Safe?
Yes. TMS is considered a safe and effective treatment when administered by trained professionals in a clinical setting. Most patients are able to resume daily activities, including driving or working, immediately after treatment.
Summary:
Most TMS side effects are mild and short-lived, including headaches, scalp discomfort, or light muscle twitching. Serious complications are rare. TMS is safe, non-invasive, and does not require anesthesia or recovery time.