How it can feel
- Thinking through treacle.
- Losing the thread mid-sentence or mid-task.
- Walking into rooms and forgetting why.
- Word-finding stalls under pressure.
- Better cognition after rest; worse after overload or poor sleep.
- After a big convulsive seizure: not knowing who people are, where you are, or how old you are — sometimes for minutes, sometimes longer.
Day to day
- Work, study and admin take longer and cost more energy.
- People may misread fog as laziness or lack of care.
- Multitasking and open-plan noise can be especially hard.
- After severe temporary memory loss, the emotional hangover can last longer than the memory gap itself — fear of “next time” is common for the person and for carers.
Why this can be FND (simply)
Attention, memory and processing depend on regulated networks. In functional cognitive symptoms those networks are inefficient under load — not evidence that you are “not trying”. After a major seizure-like episode, the brain can temporarily lose access to recent or long-term memory in a dramatic way. That does not mean the person is “faking” or that the memories are gone forever. For some people with functional seizures, memory returns as the nervous system settles — sometimes after a further episode, sometimes as they rest and reorient — minutes to about a day later. First-time or unusual patterns still need proper medical assessment.
What can help
- Sleep protection, pacing and reducing simultaneous demands.
- External aids: lists, calendars, timers, voice notes.
- Quiet work blocks and fewer context switches.
- Treating pain, mood load and seizure recovery that steal cognitive bandwidth.
- After a severe memory gap: a calm, familiar environment; one trusted person; simple reorientation (name, place, day) without quizzing or panic.
- A written seizure/memory plan for home and clinic so everyone knows what “usual recovery” looks like for you.
- Logging what happened (how long the gap lasted, what returned, any second episode) for appointments — private tools like SeizeControl can help.
- Specialist input where cognitive symptoms dominate.
This is information, not a treatment plan. Personal care decisions belong with you and your clinicians.
Severe temporary memory loss
Some people with FND — especially after a convulsive functional seizure — describe a sudden, profound memory gap that is far more dramatic than ordinary fog. Clinically you may hear related ideas such as post-ictal confusion or transient amnesia; on this page we use the plain label severe temporary memory loss.
People and carers have reported periods where the person seems to have lost years of their life, does not recognise familiar people, or appears to have “gone back” to a much younger way of speaking or behaving — sometimes described as regressing to a toddler-like state. That is terrifying for everyone in the room. It is still a real nervous-system event, not a choice and not a performance.
In many of the accounts shared with us, this state is temporary. Memory and age-appropriate awareness often return as the brain settles — for some people after rest and reorientation, and for some after a further seizure. Recovery can take minutes, or stretch toward a day. Until it does, the person may need the same practical care as someone who is acutely confused: safety, calm company, and simple orientation.
This page cannot diagnose your episode or promise recovery on a timer. What it can do is name the pattern so you are not left thinking you are the only ones this has happened to — and so you can describe it clearly to clinicians.
What people often notice
- A blank for recent events, personal history, or both.
- Not recognising a partner, parent or home — even when they feel familiar “somewhere”.
- Childlike speech, fear, or behaviour that is not their usual self.
- Asking the same questions on a loop.
- Deep exhaustion and emotional shock when memory returns.
- Carers feeling they have “lost” the person for a stretch of time.
If memory usually returns for you within a known window, write that down for ambulance crews and A&E: “This is my usual post-seizure severe temporary memory loss; it typically lasts X and then settles.” That does not replace emergency judgement — it helps teams understand your baseline. If this has never happened before, treat it as a new, severe neurological change until a clinician says otherwise.
For carers
Severe temporary memory loss after a convulsive seizure can look like regression or lost years of life. Stay calm if you can. Reduce noise and crowds. Repeat simple facts gently — who you are, that they are safe, where they are. Do not force complex questions or argue them into remembering. Keep them safe from harm while confused. If this is new, lasting longer than their usual recovery, or you are worried, seek urgent medical help. Your fear is valid too — ask for support for yourself afterwards.
FAQs
Is this early dementia?
Functional cognitive symptoms and temporary post-seizure memory loss are different from progressive dementia — but new cognitive change still needs proper assessment. This page cannot diagnose.
Why do tests sometimes look “okay” when I am struggling?
Brief tests may not capture real-world cognitive fatigue across a full day, or a short-lived post-seizure memory gap that has already resolved by the appointment. Bring a diary and witness accounts.
Can memory really disappear for hours after a functional seizure?
Some people report severe temporary memory loss after a convulsive seizure — including not knowing familiar people or seeming much younger for a while. It is frightening and real. For many, memory returns as the nervous system settles (minutes to about a day). First or unusual episodes still need medical assessment.
What should carers do during severe temporary memory loss?
Keep the person safe, reduce noise, stay calm, offer simple reorientation, and avoid grilling them to “prove” memory. Call urgent help if it is new, prolonged, different from their usual pattern, or you are worried about injury, breathing or other red flags.