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Neurofeedback Side Effects: What People Actually Report
The short answer, then the honest range behind it.
At the signal strength used in these sessions, the range people report is narrow. The most common report is that nothing noticeable happened at all. After that, people most often mention tiredness, a mild headache, feeling foggy or detached for a short period, restlessness, or unusually vivid dreams, all in the hours after a visit and usually gone within a day.
That is the whole list. Nothing on it is framed here as a benefit, and nothing on it predicts whether a session is useful for you. This page describes what people tell us, the precautions we take, and where a session is simply not offered.
If you want the after hours range in full, the next page down describes it visit by visit.
What Side Effects Does Microcurrent Neurofeedback Have?
People report very little, and the most common report is nothing at all. When someone does notice something, it sits in the hours after a visit rather than during it, and it fades within a day for most people who notice it.
We list the reports people actually bring us, including the unwelcome ones. Separating them into good and bad would imply we know which is which, and we do not.
- Nothing noticeable at all, which is by far the most common report.
- Tiredness, sometimes arriving suddenly in the early evening.
- A mild headache, usually short.
- Feeling foggy or slightly detached for a short period.
- Feeling wired or restless rather than settled.
- Vivid dreams or a change in how that night's sleep felt.
Are neurofeedback side effects dangerous?
The reports we receive are mild and short lived, and the most common report is nothing at all. That is an honest description of what people tell us, not a promise about your experience. For anything health related, your own clinician is the right person to ask, and in an emergency you should call your local emergency number.
Do the reports vary from visit to visit?
Yes. The same person can notice something after one visit and nothing after the next. That variability is part of why we do not read anything into a reaction, in either direction.
Why Do We Say Reactivity Rather Than Side Effects?
The phrase side effects belongs to medicine, where a known substance has a documented list of known reactions. This is a wellness practice, not a drug, and no such list exists for it.
What people notice after a session varies too widely between people, and between visits for the same person, to sit on a fixed list. Reactivity is the plainer word for that range. Both phrases point at the same experiences, and this page uses both so that whoever searched either word finds the same honest answer.
Is a reaction a sign the session is working?
No. It is not a progress indicator, it is not a dose signal, and a stronger reaction is not a better one. Anyone who tells you a reaction means the session is working is telling you something the evidence does not support.
What Can You Feel While the Signal Runs?
The active signal runs for a very short part of the appointment, and the current sits far below the level at which sensation typically begins. Most people report feeling nothing while it runs. A small number notice a faint tingle at a sensor site, which passes quickly and is not a reason to stop.
The rest of the appointment is quiet sitting. Sensors rest against the scalp and behind the ears with a conductive paste. Nothing is shaved and nothing breaks the skin.
Does the signal hurt?
No. The current is very low and runs briefly. Most people feel nothing at all, and a faint tingle at a sensor site is the most we hear about.
Do I have to concentrate or do a task?
No. This is a passive approach. There is no screen to watch and no sound to follow. You sit still and the session happens around you.
What About the Hours After a Session?
Whatever you notice usually fades within a day, and some people describe a couple of days. Keep the rest of the day ordinary. Drink water, eat normally, and avoid stacking a hard workout or a late night on top of a new experience if you can help it.
Booking a first visit at a time when you could go home afterward, rather than straight into something demanding, is a reasonable precaution. We suggest it before the first session rather than after.
What if something you notice lasts longer than a day?
Contact your own clinician. That conversation is not ours to have with you, and we would rather you asked them early than waited. Tell us as well, because it changes how the next visit is arranged, including whether there is a next visit.
Should you keep a record of what you noticed?
If you want to. A one line note the same evening is more useful than a detailed reconstruction a week later. Tell us anything you did not like, at any intensity.
Who Is a Session Not Offered To?
We decline when there is an implanted electrical device, when someone is unable to give their own informed agreement, when someone is under the influence of alcohol or a substance at the appointment, and when someone is in acute distress and needs a clinician rather than a quiet room.
We also ask you to speak with your own clinician first if you are pregnant, if you are under active care for anything neurological, if you have a history of seizure activity, or if you are managing an ongoing health matter with a professional. They know your history and we do not.
Why decline at all for a gentle signal?
Because gentle is not the same as appropriate for everyone. The categories above are the ones where the careful answer is no, or at least not yet, and we would rather say so than find out otherwise.
What Happens If You Notice Something You Do Not Like?
Tell the practitioner, at any intensity. The information changes how the next visit is set up, including whether there is a next visit. You can also say stop at any point in a session. Sensors come off, and nothing continues on a schedule once you say stop.
For anything health related, contact your own clinician first. In an emergency, call your local emergency number rather than us.
Will you change anything if a report is unwelcome?
Yes. Setup, signal level, and session length are all adjustable, and the honest options include deciding together that this is not for you. We will not talk you out of what you noticed.
Quick Answers
The short version, in case you scrolled
From the Journal
Related notes on signal and equipment
Longer writing that expands on this page, from the people who run the sessions.
- What Microcurrent Really MeansThe phrase covers several unrelated services that share only the size of the current. Here are the questions that tell them apart.2 minute read
- The 10-20 System, ExplainedThe 10-20 system is a naming convention for scalp positions. Here is how it works and why placement gets written down every visit.4 minute read
- Night Shifts and Wind-DownA wind-down routine assumes darkness and a quiet house. Night shift work removes both. What changes, and what still works.5 minute read
Your Care and Comfort Matter
Momentous Neurofeedback is a wellness practice using advanced neurofeedback technology to support relaxation and nervous system regulation.
The IASIS i2 Relaxation Neurofeedback System is an FDA-cleared biofeedback device indicated for relaxation training and muscle reeducation.
Our services are not a substitute for medical care, we do not provide medical care, and we do not assess or identify health conditions. Individual experiences vary. If you have questions about your health or whether neurofeedback is appropriate for you, please speak with your licensed healthcare provider.
We are always happy to answer questions about what we do and what you can expect before your first visit.
Ask Us About Anything You Noticed
A consultation is the right place for a side effects question, because the honest answer is a range rather than a headline. It costs nothing but time, and there is no obligation to book a visit afterward.