What Actually Happens During NeuroStar Treatment
The most common side effects are headache, scalp discomfort, and lightheadedness during or immediately after a session. They tend to be mild and fade within an hour. For a small number of patients, the headache can be persistent enough that you skip the next treatment. I have seen this happen more often than clinicians usually admit in promotional materials. It is not dangerous, but it is real and it affects compliance. Headache is the number one complaint. It usually feels like a tension headache — pressure across the forehead or behind the eyes. Most people take a standard dose of ibuprofen or acetaminophen before or after the session and it resolves. I had a patient who got it every single time, so we switched the coil placement by half a centimeter and changed the stimulation intensity from 120% to 110% of motor threshold. The headaches stopped completely. That kind of adjustment is not in the standard protocol, but it works. Scalp discomfort is very common and often misunderstood. The magnetic pulses cause your scalp muscles to twitch. It feels like an elastic band being snapped against your head repeatedly. Some people describe it as surprisingly painful on the first few sessions, then it just becomes annoying. The numbness that sets in after about four to six treatments is normal and actually means you are getting used to it. If you are still feeling sharp pain at session ten, tell your provider. You might be getting too much power delivered.
Lightheadedness happens to roughly a third of patients. It is usually brief. Sitting up too fast after the session makes it worse. I always tell my patients to stay seated for two minutes after the machine stops before standing. It sounds silly but it cuts down the dizziness almost entirely. Fatigue is another one people do not talk about enough. Some days after treatment you will feel like you ran a marathon even though you sat in a chair. This is not imaginary. The brain is doing a lot of metabolic work during TMS. I recommend scheduling lighter days after your sessions, especially if you have a cognitively demanding job. Hearing changes are a real concern because the machine makes a loud clicking sound. You will be given earplugs or headphones, but they do not block everything. I have had patients come back complaining of a muffled feeling in their ears that lasted for hours. Long-term hearing damage from proper TMS use is extremely rare, but I make sure everyone wears both earplugs AND over-the-ear muffs. Double protection takes thirty seconds to apply and it matters.
Seizure risk is the side effect that gets the most attention and it is genuinely the most serious. The FDA rate is about 0.1% for the NeuroStar device, which is roughly one in a thousand. This risk goes up significantly if you have a history of seizures, are on certain medications that lower the seizure threshold, or have structural brain abnormalities. Your provider should be screening for these before they ever place the coil on your head. If they have not asked about your medical history in detail, ask why. Mania or hypomania is a risk for people with bipolar disorder. TMS can trigger a manic episode if you are not already stabilized on a mood stabilizer. This is non-negotiable — if you have bipolar disorder and want TMS, you need to be on a solid medication regimen first. I have seen this go badly when patients skipped that step. Cognitive effects are mixed. Some patients report brain fog for a day or two after starting treatment. Others feel sharper. The cognitive changes are usually temporary and resolve on their own. There is no strong evidence that TMS causes lasting memory problems, but the idea that it might is not entirely baseless either.
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One thing nobody warns you about is the anxiety spike during the first week. A subset of patients actually feel more anxious right before and during early sessions. This is likely related to the discomfort and the uncertainty of the experience rather than the magnetic pulses themselves. It typically levels off after session five or six. If you are a person who already struggles with anxiety, this is worth discussing with your provider beforehand so they can monitor it. Facial twitching is something you may or may not experience. The magnetic field can stimulate facial nerves, causing your cheek or jaw to twitch during a session. It is harmless but unnerving if you are not expecting it. Your provider can adjust the coil angle to minimize this. There is also the issue of interference with implants. If you have a dental filling, a metal plate, or a cochlear implant, you need to disclose this. The magnetic field interacts with ferromagnetic materials. Most fillings are fine, but titanium plates in the jaw or skull can redirect the field in unpredictable ways. I had a case where a patient had a titanium mesh in their frontal bone from a previous surgery, and the stimulation was essentially wasted on that side. We had to reposition the coil and adjust the intensity, which made the treatment less effective overall.
The duration of side effects is an important practical question. For the vast majority of people, everything I listed above resolves within 24 hours. A small percentage report residual headache or fatigue into the next day. Very few people carry symptoms beyond that point. If side effects persist past the end of your treatment course, that is a red flag that something is off with the protocol. Long-term side effects are not well studied because TMS has only been around for routine clinical use for about fifteen years. What we know from follow-up studies is reassuring — no cumulative damage, no cognitive decline, no increased seizure risk after treatment ends. But we simply do not have data on what happens twenty or thirty years out. That is a limitation of the entire field, not just NeuroStar specifically. One practical tip that is worth repeating: tell your provider about every side effect you experience, no matter how minor it seems. I have seen patients suffer in silence because they did not want to "complain." Small adjustments in intensity, coil placement, or timing can eliminate most side effects. The protocol is not set in stone. It is a starting point that should be modified based on your individual response.
If you are considering NeuroStar TMS, the most important thing is finding a provider who takes side effects seriously and is willing to adjust the treatment rather than pushing you through on a rigid schedule. That makes all the difference in whether this is tolerable or miserable.
