TMS for depression is generally non-invasive with mild, temporary scalp discomfort or headaches, while clinicians screen for rare risks such as seizures before treatment.
TMS Side Effects and Safety: A Pennsylvania Patient Guide
Transcranial magnetic stimulation (TMS) is a non-invasive treatment that uses magnetic pulses to stimulate targeted areas of the brain. It is most commonly discussed for depression, particularly when other treatments have not provided enough benefit or have caused difficult side effects.
TMS was cleared by the US Food and Drug Administration for major depressive disorder in 2008, and for depression with comorbid anxiety in 2021. A typical course involves weekday appointments over roughly six to nine weeks, often totalling about 36 sessions.
For people considering treatment in Pennsylvania, it is useful to understand what TMS feels like, which side effects are common, what risks are rare but important, and what information a clinician needs before treatment begins.
What TMS treatment usually feels like
During a session, you sit in a treatment chair while a clinician positions a magnetic coil against your scalp. The device makes repeated clicking sounds and produces pulses that may feel like tapping, knocking or tightening on the scalp.
The treatment does not involve surgery, anaesthesia or electrical current passing through the body. You remain awake and can usually return to normal daily activities afterwards, unless your own clinician advises otherwise.
Before the main treatment course, the team will normally identify an appropriate treatment location and set the pulse strength. This part of the process can help make sessions more tolerable and ensure the treatment is tailored to you.
It is sensible to ask the clinic how they handle discomfort, who will be present during treatment, and what you should do if you feel unwell between appointments.
Common TMS side effects
Most TMS side effects are mild and temporary. The most commonly reported effects are scalp discomfort and headache.
Scalp discomfort may occur during treatment, particularly at the beginning of a course. Some people describe a tapping, pulling or pressure-like sensation where the coil rests against the head. This can become less noticeable as a person gets used to the treatment.
Headaches can occur during or after a session. They are generally short-lived and may respond to simple measures recommended by your clinician. Do not assume that any painkiller is suitable for you: check with your treatment team or usual healthcare professional, particularly if you take other medicines or have medical conditions.
Other temporary effects can include:
- Tingling or twitching in facial muscles near the treatment area
- Mild jaw discomfort
- Tiredness after an appointment
- Light-headedness
- Temporary changes in concentration or mood
Not everyone experiences these effects. If discomfort is affecting your ability to continue, tell the clinician during the session rather than trying to tolerate it silently. The coil position, treatment settings or other practical aspects of the appointment may sometimes be adjusted.
TMS clinics commonly provide ear protection because the device produces repeated clicking sounds. Use the protection supplied and let staff know if you have hearing concerns.
The rare risk of seizure
Seizure is a rare but recognised risk of TMS. A seizure is a sudden episode of abnormal electrical activity in the brain. It can involve changes in awareness, unusual movements or other symptoms.
Clinics screen for factors that may increase seizure risk before treatment starts. This is one reason a full medical history matters, even if some information seems unrelated to depression.
Your clinician may want to know about:
- Any previous seizure or diagnosis of epilepsy
- A significant head injury, stroke, brain tumour or other neurological condition
- Medicines that may affect seizure threshold
- Recent changes in prescribed medication
- Heavy alcohol use, alcohol withdrawal or use of recreational drugs
- Severe sleep deprivation
- Eating disorders or other medical conditions that could affect overall safety
Having one of these factors does not automatically mean that TMS is unsuitable. It does mean that the clinician needs to assess the situation carefully and discuss the balance of potential benefits and risks.
If you experience a seizure during treatment, the clinic should have procedures in place to respond promptly. Ask how the service manages emergencies and whether medical support is available on site or nearby.
When TMS may not be suitable
TMS is not right for everyone. In particular, certain implanted devices or metal objects in or close to the head may make treatment unsafe because of the strong magnetic field.
It is especially important to tell the clinician about any non-removable metal or electronic implant in the head or neck area. Examples may include some cochlear implants, implanted neurostimulators, certain aneurysm clips or other devices. The clinic will need the exact details where possible, including the manufacturer, model and date of implantation.
Do not assume that all metal in the body prevents TMS. Dental fillings, braces and metal elsewhere in the body may not necessarily rule it out, but the treatment team must make that decision after reviewing your circumstances.
You should also discuss:
- Previous brain surgery
- Hearing problems or use of hearing aids
- Chronic pain conditions affecting the head, face or jaw
- Pregnancy, plans for pregnancy or breastfeeding
- Heart conditions and any implanted cardiac device
- Other ongoing mental health treatment, including psychological therapy
- Any recent hospital admission or major change in physical health
A safety assessment is not a test you can pass or fail. Its purpose is to help the clinic decide whether TMS can be provided safely, whether additional checks are needed, or whether another treatment approach may be more appropriate.
What to tell your TMS clinician
Be open and specific during the initial consultation. Bring an up-to-date list of all prescribed medicines, over-the-counter treatments, vitamins, supplements and herbal products. Include the dose and how often you take them, if known.
Tell the clinician about changes as they happen during the course. This includes a new medicine, a dose change, missed doses, changes in alcohol or substance use, or several nights of poor sleep. These details can be relevant to seizure risk and to how you feel during treatment.
It is also important to report changes in your mental health. Contact the clinic or your usual mental health professional if you develop worsening depression, new agitation, unusual mood elevation, impulsive behaviour or thoughts of harming yourself.
For urgent concerns about your safety or immediate risk of self-harm, seek emergency help straight away rather than waiting for your next TMS appointment.
Questions to ask before starting
A Pennsylvania clinic should be able to explain its screening and safety processes in clear terms. Useful questions include:
- Am I a suitable candidate for TMS based on my medical history?
- Do any of my implants, previous injuries or medicines need further review?
- What side effects do you commonly see, and how do you manage them?
- What should I do if I get a headache or feel unwell after a session?
- Who should I contact outside appointment hours?
- What is your procedure if a seizure or other medical emergency occurs?
- Should I keep taking my current medicines during treatment?
Do not stop antidepressants, anti-seizure medicines, sedatives or other prescribed treatment without advice from the clinician who manages them.
Practical safety considerations during a course
A standard TMS course often involves frequent weekday visits. The practical demands can matter as much as the medical screening. Plan for travel, work, caring responsibilities and rest, especially during the first part of treatment when you are learning how your body responds.
Pennsylvania has a wide range of listed treatment locations, with 276 published clinics in the TMS Therapy Pennsylvania directory. Listings include clinics in Pittsburgh, Exton, Saint Marys, King of Prussia, Erie, Philadelphia, Camp Hill, Media, Emmaus, Doylestown, Chambersburg and Johnstown.
Before choosing a provider, confirm that it offers the form of TMS recommended for you, accepts or can check your insurance arrangement, and can accommodate your medical needs. Insurance arrangements vary. Plans commonly encountered in Pennsylvania include Independence Blue Cross, Highmark Blue Shield, UPMC Health Plan, Aetna, Cigna, UnitedHealthcare, Pennsylvania Medical Assistance (Medicaid), and Medicare, including Advantage plans.
Coverage does not remove the need for clinical screening. The treating clinician remains responsible for assessing whether TMS is appropriate and safe for you.
Getting help in Pennsylvania
Use the TMS Therapy Pennsylvania directory’s clinic listings to find local providers, read the insurance guide for practical coverage information, and visit the contact page if you need help using the directory.
This article is educational information, not medical advice.
This page is informational and is not medical advice.