Forgetfulness: telling normal and pathological causes apart

At a glance

  • Occasional forgetfulness is normal and usually no cause for concern, especially with stress, tiredness or in older age.
  • What matters is the distinction: with normal forgetfulness the memory comes back, with dementia it stays lost and everyday life increasingly suffers.
  • Many causes are treatable, such as a depression, an underactive thyroid, a vitamin deficiency or side effects of medications. Then the memory often improves too.
  • Warning signs such as increasing forgetting, getting lost or word-finding problems should be assessed calmly by a doctor, because it is worthwhile.
  • With sudden confusion or memory loss, especially with speech or paralysis symptoms, the rule is: call the emergency number immediately.

Forgetting the neighbour's name, misplacing the keys, missing the most important item at the supermarket without a list: almost everyone knows forgetfulness, and yet it often triggers a quiet worry about whether something serious is behind it. The reassuring news first: in the vast majority of cases forgetfulness is harmless, and even where a cause can be found, it is often treatable. This guide helps you tell normal from pathological forgetfulness, shows the most important treatable causes and gives you a small self-check that makes classification easier, entirely without scaremongering. This way you get a clearer picture of when waiting is fine and when a conversation at the practice becomes sensible.

What is normal forgetfulness?

The brain changes with age, similar to the rest of the body. This is a natural process and not a disease. It then takes a little longer to recall new names or information, and some things have to be repeated more often to stick. Such age-related changes hardly affect everyday life as a rule and are not considered pathological. They mainly concern the speed at which memories are retrieved, not the content itself, which is usually preserved. The distinction between forgetting and inattention is also important. If you go to the basement and then no longer know what you wanted, you usually never actively memorised the goal, because your thoughts were elsewhere. That is absent-mindedness, not a memory problem, and something that happens to everyone. Stress, multitasking, lack of sleep and exhaustion in particular lead to such lapses of concentration, which disappear again with a little rest.

How remembering works

For something to stay in the memory, it first has to be taken in, then stored and later retrieved. Even the first step, taking in, only succeeds with attention. Anyone who is distracted, tired or stressed does not properly store an information in the first place and therefore cannot retrieve it later. This explains why the same person has a good memory on a calm day and seemingly forgets everything on a hectic day. Forgetfulness is therefore often not a problem of storage but of attention, and that is exactly good news, because a lot can be changed about it. Anyone who memorises things consciously and with full attention, for example by repeating them aloud or linking them to an image, forgets them noticeably less often.

Normal or pathological?

The overview below compares typical features. It is not a test and does not replace a diagnosis, but helps you classify your observations and prepare the conversation at the practice. In reality the boundaries are fluid, and not every feature fits in every situation, which is why in the end the medical judgement always counts.

Feature More likely normal More likely to assess
What is forgotten Names, where the keys are, a word on the tip of the tongue Whole conversations or events that just happened
Memory Comes back with a little time Stays permanently lost
Orientation Familiar, no getting lost Getting lost in known places
Everyday life Continues independently Familiar tasks such as cooking or finances become hard
Who notices it Oneself, one is worried Rather relatives, those affected often do not notice
Course Stable, rather dependent on stress Progresses slowly but steadily

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When the cause is treatable

Especially important and reassuring is that behind forgetfulness there is often a treatable cause, not dementia. If it is recognised and treated, the memory often improves too, sometimes even completely. Experts also speak here of reversible causes, because the symptoms can recede with the right treatment. The most important of these causes include:

  • Depression: Depression can strongly impair concentration and memory, which is called pseudodementia. With successful treatment the mental performance improves too. An important difference from dementia is that those affected usually perceive their memory problems very consciously and mention them openly. Read more in our article on depression.
  • Underactive thyroid: An underfunction, often from Hashimoto's thyroiditis, slows thinking and memory and often comes with tiredness and lack of drive. It is easy to detect with a blood test and treatable. Read more in our article on Hashimoto.
  • Vitamin B12 deficiency: A lack of vitamin B12 can impair memory and concentration and can be detected with a blood test and specifically corrected, for example via supplements or injections.
  • Medications: Some remedies, such as sedatives and sleeping pills, can cause forgetfulness, above all in combination. A look at the entire medication plan is therefore always worthwhile.
  • Lack of sleep and stress: In deep sleep the brain consolidates memories and clears waste products. Lack of sleep, an untreated sleep apnoea and constant stress let the memory decline.
  • Alcohol and lack of fluid: Regular alcohol harms the memory, and especially in older people, drinking too little can also cause forgetfulness. Both can be changed comparatively easily.

Forgetfulness in special phases of life

Sometimes forgetfulness has to do with a temporary phase of life and is then no cause for concern. During menopause many women complain of concentration and memory problems that are linked to the hormonal changes and often improve again after a certain time. After a severe infection, in a phase of exhaustion or burnout or under strong emotional strain, the memory can also decline noticeably, because the brain then simply lacks the reserves for full attention. In such cases it is worth first ensuring relief, sleep and recovery and not interpreting the forgetfulness prematurely as a sign of a serious illness. If the symptoms do not improve with more rest or continue to increase, it still makes sense to have them medically assessed.

When it can point to dementia

Experts speak of dementia when the memory and other mental abilities decline so far that everyday life suffers considerably and independence is lost. Alzheimer's is the most common form. At the start the short-term memory is usually affected, and unlike with normal forgetfulness the information stays permanently lost. Typically those affected tell the same things over and over, sometimes in the same words, because they cannot remember that they have already spoken about it.

Have these signs medically assessed

Beyond normal forgetfulness go, for example: repeating the same questions or stories over and over without remembering, putting objects in unusual places, difficulty with familiar tasks such as cooking or bills, getting lost in familiar surroundings, increasing word-finding problems and unexplained changes of mood or personality. If you notice such signs in yourself or a relative, have them assessed calmly by a doctor. This is no reason to panic, but the sensible next step. An exception is a sudden confusion or a sudden memory loss, especially together with speech or paralysis symptoms, because that can be an emergency and should be assessed immediately via the emergency number.

Important to know: forgetfulness is not the same as dementia. Read more about how dementia shows and what helps then in our article on dementia. And even if the suspicion is confirmed, an early diagnosis brings advantages, because the course can be accompanied and treated better. Early on, important things can also be arranged calmly and support organised, while one can still decide for oneself.

The small self-check

This short self-check does not replace a diagnosis but can give you a first orientation. The more points you answer with yes, the more a conversation at the practice is worthwhile. A single point is not yet a cause for worry, because everyone has a bad day or a phase with a lot of stress now and then.

  • Have you recently been forgetting appointments, conversations or names noticeably more often than before, even though you make an effort?
  • Do memories stay away completely instead of coming back on their own later?
  • Is finding words in conversation becoming increasingly difficult for you, so that you often search for terms?
  • Have you ever got lost or felt unsure in a familiar place where you actually know your way well?
  • Are familiar tasks such as cooking, shopping or finances becoming noticeably harder for you than before?
  • Have relatives or friends spoken to you about changes in your memory?

What you can do for your memory

The brain stays able to learn into old age, and you can do a lot for your memory. Pay attention to enough sleep, regular exercise and a balanced diet. Exercise promotes blood flow to the brain and demonstrably works against forgetfulness and low mood at the same time. Mental activity and above all social contacts keep the brain fit, which is why it is worth going among people and learning new things, be it a language, an instrument or a new hobby. Reduce stress, because tension makes remembering harder, and limit alcohol. Memory aids such as a calendar, note lists and fixed places for keys and glasses relieve everyday life and take pressure off remembering. An adequate fluid intake and avoiding too much alcohol also noticeably support mental performance. Anyone who is very forgetful over a long period should not rely on such aids alone, however, but have the cause assessed.

What the doctor does

The assessment begins with a detailed conversation, ideally together with a close person, because relatives often perceive changes differently and earlier than those affected themselves. Added to this are short memory tests, such as the well-known clock test or a questionnaire, that allow a first classification within a few minutes. A blood test checks the thyroid, vitamin B12, blood sugar and other values to find treatable causes, which can often be remedied easily. Depending on the result, imaging of the head or a referral to a memory clinic follows, where experts from several fields clarify the cause precisely. Important here: the tests serve classification and are not there to frighten you, but to find treatable causes in good time.

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The bottom line: forgetfulness is usually normal and well explainable, and where a cause is behind it, it is often treatable. What matters is the calm distinction between normal forgetting and a change that affects everyday life. Instead of letting yourself be led by worries, a sober look at the facts and, if in doubt, an open conversation help. Take warning signs seriously without panicking, and speak openly with your GP practice. An early assessment creates clarity and opens up the best opportunities to do something, and often also removes the nagging uncertainty. In most cases the result is reassuring, and where a cause is found, it is often treatable.

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Frequently asked questions about forgetfulness

Yes, occasional forgetfulness is normal and no cause for concern. Names, appointments or where the keys are slip everyone's mind at some point, especially with stress, tiredness or when your thoughts are elsewhere. With age this forgetfulness increases somewhat without a disease being behind it. What matters is whether the memory comes back and everyday life stays intact.
You should look more closely when the forgetting becomes more frequent and stronger, whole conversations or events are lost, you get lost in familiar places or familiar tasks such as cooking and finances become difficult. When relatives are worried or word-finding and orientation clearly decline, a medical assessment also makes sense.
With normal forgetfulness the memory comes back with a little time, everyday life stays independent, and you notice the gaps yourself. With early dementia the information stays permanently lost, everyday life becomes increasingly difficult, and often it is the relatives who notice the changes. The reliable distinction is made by the medical practice.
Yes. Depression can noticeably impair concentration and memory, which is then called pseudodementia and can resemble dementia. The important difference: with successful treatment of the depression, the memory also improves. Especially in older people, depression often shows as a lack of drive and withdrawal rather than as sadness.
Yes. An underactive thyroid, often from Hashimoto's thyroiditis, can cause memory gaps and mental slowing besides tiredness and lack of drive. The good thing is that the thyroid can be checked with a simple blood test and treated well with medication, so that the forgetfulness often improves again too.
Yes. Certain remedies, such as sedatives and sleeping pills or some other medications, can impair concentration and memory, especially when several are taken at the same time. Do not stop anything on your own, but take your medication list to the appointment and discuss whether a remedy is favouring the forgetfulness.
A lot helps the memory: enough sleep, regular exercise, mental and social activity, little alcohol and enough fluid. Reducing stress is especially effective, because tension makes remembering harder. Memory aids such as a calendar, lists and fixed places for important things relieve everyday life in addition.
If the forgetfulness increases, affects everyday life or worries you and your relatives, a doctor's visit makes sense. It is worthwhile because many causes are treatable and even with dementia an early diagnosis brings advantages. With sudden confusion or memory loss, especially with speech or paralysis symptoms, call the emergency number immediately.
At the start there is a detailed conversation, often with a close person too. Added to this are short memory tests such as the clock test and a blood test that uncovers treatable causes such as a thyroid disorder or a vitamin B12 deficiency. Depending on the result, imaging of the head or a referral to a memory clinic follows.

Sources

  • gesund.bund.de and Gesundheitsinformation.de (IQWiG): Forgetfulness, memory disorders and dementia. Accessed 2026.
  • Alzheimer Forschung Initiative and MSD Manual: distinction of normal forgetfulness, pseudodementia and reversible causes. Accessed 2026.
  • Neurology and geriatrics professional information on diagnosis, memory tests and treatable causes. Accessed 2026.

This article is for general information and does not replace medical advice, diagnosis or treatment. With sudden confusion or memory loss, especially together with speech, vision or paralysis symptoms, please call the emergency number immediately.