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Medically reviewed guide · Last updated: 1 August 2026 · Reading time: approx. 10 min
Word-Finding Difficulties: Stress, Thyroid, Dementia — or an Emergency?
At a glance
The most important thing firsta word-finding or speech difficulty that comes on suddenly is a stroke until proven otherwise — even when it disappears again by itself after a few minutes. In that case call 112, do not wait.
Anything that develops slowly is something else entirely.The word that is on the tip of your tongue and simply will not come is a normal phenomenon — it becomes more frequent with age and, on its own, says nothing about dementia.
The most common explainable causesare overtiredness and stress, lack of sleep, exhaustion or depression, an underactive thyroid, a vitamin B12 deficiency, migraine with aura and the recovery phase after an epileptic seizure.
Medicines are almost always overlookedantiepileptics, sedatives and sleeping tablets, and several preparations with anticholinergic effects taken together can noticeably slow down word finding — often dose-dependently and reversibly.
Get it assessed immediatelyspeech that suddenly falters or slurs, suddenly no longer understanding what is said, together with a drooping corner of the mouth, one-sided weakness or numbness — even if everything is back to normal after a few minutes.
The most common causes compared
Cause
How it starts
Typical pattern
First step
Stroke or TIA
Abruptly, within seconds to minutes
Often with a drooping corner of the mouth, one-sided weakness, visual disturbance; can resolve again
112 immediately — even if it has resolved completely
Stress, overtiredness, multitasking
Depends on the situation, familiar for as long as you can remember
Affects names and rare words, the word comes back to you later by itself
Sleep and breaks, observe rather than treat
Sleep problems and exhaustion
Creeping up over weeks
Together with difficulty concentrating and daytime sleepiness, worst in the mornings
Raise the subject of sleep and workload
Depression
Over weeks to months
Slowed thinking, loss of drive, low mood; often with self-doubt about your memory
See your GP practice, it is treatable
Underactive thyroid, B12 deficiency
Creeping up over months
With tiredness, sensitivity to cold, weight gain, or with tingling and pallor
Blood test at your GP practice
Migraine with aura
Building up over 5 to 20 minutes
Temporary, usually under an hour, followed by headache; a familiar pattern
The first time, always have it assessed
After an epileptic seizure
Directly following the seizure
Confusion and speech difficulty that resolves over minutes to hours
Neurology follow-up, document the seizure
Medicines and alcohol
After a new start, a dose increase or a combination
Dose-dependent, often with tiredness and slowing; improves after an adjustment
Check the medication list, speak to your practice
Dementia
Very slowly over months to years
It is not only words that are missing — everyday abilities are lost too, and others notice first
Get it assessed together with someone you trust
Table scrolls to the right
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First things first: sudden always means an emergency
A single question decides everything that follows: how fast did it come on? What creeps up over months is a question for your next routine appointment. What was there within seconds to minutes is an emergency — even when it has since gone again.
Sudden speech difficulty: 112 immediately — even if it goes away again A word-finding or speech difficulty that sets in suddenly counts as a stroke until proven otherwise. Call 112 (emergency services in Germany) immediately — even when everything resolves after five minutes: a temporary interruption of the blood supply like this (a TIA) is not the all-clear, it is an urgent warning. The risk of a lasting stroke is highest in the days that follow, and that is exactly when it can be reduced most effectively.
The FAST scheme helps you assess the situation in seconds — deliberately simple enough to work under stress:
F — Face: ask the person to smile. Is one corner of the mouth drooping?
A — Arms: ask them to hold both arms out in front of them. Does one arm drift down or turn inwards? Other signs of one-sided weakness fit the same picture.
S — Speech: ask them to repeat a simple sentence. Does the speech sound slurred, are words missing, is the sentence not understood?
T — Time: if any one of these signs is abnormal, every minute counts. Call 112 and note the time it started — that time helps decide which treatments are possible.
The causes in detail
Once an emergency has been ruled out, the picture becomes far more relaxed: the vast majority of everyday word-finding difficulties have harmless or readily treatable reasons.
The tip-of-the-tongue phenomenon: normal, not a disease
You know exactly which word you mean — it just will not come, and minutes later it occurs to you in passing. This “it’s on the tip of my tongue” is a normal feature of language memory. It affects every age group and becomes more frequent over the years without being a sign of illness. Proper names, rare technical terms and words you have not used for a long time are particularly vulnerable; tiredness, time pressure, noise, multitasking and — of all things — the worry of embarrassing yourself all make it worse.
Something important to take the pressure off: the knowledge itself is intact — you recognise the right word immediately when it comes up, and you can talk around it. That is exactly what sets it apart from the forms that do need assessing.
Lack of sleep, exhaustion and depression
Word retrieval is sensitive to exhaustion. With sleep disorders, attention and working memory drop off first — and with them your quick access to the word. It is much the same with work-related exhaustion such as burnout and with persistent fatigue.
In depression, thinking really is slowed and self-assessment is harsher. When the symptoms become so marked that they suggest dementia, this is called depressive pseudodementia — with one very useful practical point: under successful treatment they usually resolve. That is why questions about mood, drive and sleep belong in every assessment.
Thyroid, vitamin B12 and other blood values
An underactive thyroid slows the metabolism and with it your thinking; tiredness, sensitivity to cold and weight gain are typically there as well. It is easy to pick up with a blood test and responds well to treatment.
A marked vitamin B12 deficiency can also cause cognitive symptoms, often with tingling in the hands and feet, pallor and exhaustion — above all on a purely plant-based diet, after stomach surgery, with chronic gastrointestinal conditions and on certain acid-blocking medicines or metformin. Other values worth checking: blood sugar, kidney and liver values, electrolytes, iron status — see Understanding blood values.
Migraine with aura
In migraine with aura, speech difficulties can occur alongside visual disturbances: words will not come, sentences get muddled. What is characteristic is the slow build-up over five to twenty minutes and complete resolution usually within an hour, often followed by headache.
The first time, the emergency rule applies The slow build-up is what distinguishes an aura from a stroke, where everything is there in one go. But you may only rely on that distinction with a known, medically confirmed pattern. If a speech difficulty occurs for the first time, it counts as an emergency — migraine or not.
After an epileptic seizure
After a seizure in epilepsy there is a recovery phase in which speech, orientation and attention can be temporarily disturbed. It lasts minutes to hours and resolves. A first-ever seizure should always be assessed as an emergency.
Dementia: the distinction this is really about
Worry about dementia is the most common reason for reading up on this subject. So here is the sober assessment: word-finding problems on their own are not a sign of dementia. What matters is whether other abilities are being lost.
The missing word: normal when it comes to you later and you can talk around it — notable when it is replaced by “thingy” and sentences are left unfinished.
Everyday abilities: normal when familiar routines still work — notable when banking, cooking, appointments or taking medicines start going wrong.
Orientation: briefly having to think about what day of the week it is, is normal — getting lost in familiar surroundings is not.
Who notices it and how it progresses: normal when you notice it yourself and it varies with sleep and stress — notable when it is mainly the people around you who notice and it increases steadily over months.
Forgetfulness and concentration problems are also non-specific on their own. If they occur together, increase over months and have consequences in everyday life, then an assessment is the right step — not in order to confirm a catastrophe, but because a relevant share of the causes is treatable. Pushing it away out of fear is the worst option.
Self-observation: the two-week diary
Memories of things having “somehow got worse” are not much use in a consultation; two weeks of notes are worth a great deal. They do not replace a diagnosis, but they make the appointment precise.
When and how often. Date, time of day and a rough tally per day. It is about the trend, not about precision.
In which situation. Under time pressure, in a group, in noise, on the phone, after a bad night, after alcohol the evening before?
Which kind of word — and how it ended. Proper names, technical terms or everyday objects? Did the word come to you later, could you talk around it, or did the sentence break off? Everyday words carry more weight than names.
Accompanying signs and medicines. Headache, dizziness, numbness, visual disturbance, low mood — and what has changed in your medication recently.
An outside view. Ask someone you trust whether they have noticed anything. That outside perspective is often more valuable diagnostically than your own.
Warning signs: when not to wait
Sudden difficulty finding words, speaking or understanding speech — 112, even if it has resolved completely
Speech difficulty with a drooping corner of the mouth, one-sided weakness, numbness or visual disturbance
A first-ever speech difficulty with no known migraine or seizure pattern
Speech difficulty after a fall or a blow to the head, even hours later
Speech difficulty with a high fever, a stiff neck or confusion
A marked increase over weeks to months with problems in everyday life
New word-finding difficulties after starting a medicine or increasing its dose
The treatment pathway: step by step
Rule out an emergency. Was it sudden? Are there FAST signs? Then every further consideration ends here — 112.
Document for two weeks. Frequency, situation, accompanying signs, outside view — take the diary, your medication list and if possible someone you trust along to the appointment, see Preparing for your doctor's visit.
See your GP practice. A conversation, an examination, a blood count with thyroid value, vitamin B12, blood sugar, kidney and liver values and electrolytes — plus questions about mood, sleep, alcohol and workload. The complete medication list belongs with it, with start dates.
If the picture is unclear: neurological assessment. Cognitive testing, imaging of the head if needed, and an EEG.
Treat what is treatable. Thyroid, B12 deficiency, depression, sleep apnoea, medication effects — this is where the biggest lever lies. The decision is made by your treating practice.
The medication angle: the cause most often overlooked
Hardly anything is checked as rarely and can be corrected as well as your own medication list. Four groups are particularly relevant.
Antiepileptics
Antiepileptics act on how readily nerve cells fire — which is why cognitive side effects are part of the working principle, above all at higher doses and when the dose is increased quickly. The differences are considerable: lamotrigine is regarded as comparatively favourable cognitively, while with levetiracetam mood and irritability are more to the fore. Other substances in the group are far better known for causing speech problems.
Never stop antiepileptics on your own Stopping them abruptly can trigger seizures — even when the medicine is not being taken for epilepsy. The suspicion that a preparation is slowing your word finding is a reason for a conversation, not a reason to leave it out. Dose adjustments and switches belong in neurological hands.
Sedatives and sleeping tablets
Benzodiazepines such as lorazepam and Z-drugs such as zolpidem dampen the central nervous system and impair both memory formation and word retrieval — and not only at night: a “hangover” effect the following morning is common, particularly with a longer duration of action, a higher dose and in older age. Both groups carry a considerable potential for dependence; after longer use, stopping has to be tapered and supervised.
Anticholinergic burden across several preparations
Many medicines have a partial anticholinergic effect — they block acetylcholine, a messenger substance that is central to memory and attention: tricyclic antidepressants such as amitriptyline, older antihistamines, antispasmodic bladder medicines, remedies for nausea.
What counts is the sum: three preparations each with a weak effect can add up to more than one strong one. In older age this is particularly relevant, because sensitivity increases and several long-term medicines are the rule — see also the guides Medications in old age and Polypharmacy: many medications.
Alcohol — on its own and in combination
Alcohol impairs word retrieval and memory acutely, and heavy consumption does so lastingly. With sleeping tablets, sedatives or antiepileptics the dampening effects reinforce one another; see also the guide Medications and alcohol. Also relevant: opioids, high-dose steroid treatments and muscle relaxants. And the reverse case — stopping some medicines can temporarily cause word-finding problems too.
Spot the anticholinergic burden before it adds up
The interaction check shows combinations that do more together than on their own.
First the honesty that rarely comes with this subject: brain-training programmes mainly make you better at exactly those exercises. Any transfer to everyday language or to dementia risk is not established. The measures with the best evidence are unspectacular.
Regular exercise and sleep — physical activity is the best-studied single factor for cognitive health; several times a week, something that leaves you slightly out of breath, and walking counts. Memories are consolidated during sleep: lack of sleep and untreated pauses in breathing at night feed straight through to attention and word retrieval. Loud snoring with daytime sleepiness should be looked into.
Have your hearing checked — the underrated point. Untreated hearing loss is regarded as one of the most significant modifiable risk factors for cognitive decline: if following a conversation is hard work, you use up capacity on understanding that is then missing when you formulate — and you withdraw. A hearing test is quickly done.
Treat vascular risks, stay in conversation, review your medication — high blood pressure, diabetes, blood lipids and smoking are the same lever that also lowers your stroke risk. Real conversations exercise word retrieval under time pressure. And once a year have your complete medication list reviewed at your practice or pharmacy: long-term preparations that are no longer needed are a common find.
Two weeks of diary — and the appointment gets specific
Frequency, situation and medicines documented and ready to show.
On their own, no. Searching for names and rare words is normal and becomes more frequent with age. You should take notice if everyday abilities are also declining, orientation is suffering, it increases over months and the people around you notice it more clearly than you do. An assessment then makes sense, not least because many causes are treatable.
Call the emergency services immediately all the same. A temporary interruption of the blood supply to the brain is an urgent warning of a lasting stroke. The risk is highest in the days that follow and can be reduced considerably by a rapid assessment. Note the time it started.
FAST stands for Face, Arms, Speech, Time. Ask the person to smile, to hold both arms out in front of them and to repeat a sentence. If one corner of the mouth droops, one arm drifts down or the speech is disturbed, a stroke is suspected. Then every minute counts: call 112 and note the time it started.
Above all antiepileptics, benzodiazepines and Z-drugs, as well as preparations with anticholinergic effects such as tricyclic antidepressants and older antihistamines. In older age the sum of several such medicines counts for a great deal, and alcohol reinforces the effects. Do not stop anything on your own; have the list reviewed by a doctor instead.
Practising such programmes mainly makes you better at those exercises. Any transfer to everyday language or to dementia risk is not convincingly established. Better studied are physical activity, enough sleep, treating a hearing loss, social contact and keeping blood pressure and blood sugar under control.
Gesundheitsinformation.de, German Institute for Quality and Efficiency in Health Care (IQWiG): Stroke, dementia, depression — German source. Accessed 2026.
gesund.bund.de (German national health portal): Stroke, speech and language disorders, underactive thyroid — German source. Accessed 2026.
Guidelines of the German Society of Neurology (DGN) on stroke, dementias and migraine (AWMF guideline register) — German source. Accessed 2026.
Summaries of product characteristics for the active substances mentioned. Accessed 2026.
This article is for general information and does not replace medical advice, diagnosis or treatment. The self-observations described are a guide only and not a diagnosis. If word-finding or speech difficulties come on suddenly, or if there is a drooping corner of the mouth, one-sided weakness or a visual disturbance, please call 112 without delay — even when the symptoms have resolved by themselves.
