"It is probably just stress" is offered as reassurance and lands as dismissal, and it deserves a more careful treatment than either.
Two things are true simultaneously. Stress is a very common cause of cognitive symptoms, so the statement is often accurate. And stress produces genuine, measurable impairment, so it is not a reason to stop taking the symptoms seriously.
What sustained stress actually does
Broadly, and without overclaiming the mechanisms:
Working memory shrinks. The mental workspace holds less. This shows up as losing the thread mid-sentence, being unable to hold a number long enough to write it down, and losing your place in a multi-step task.
Attention narrows and becomes harder to direct. Under threat, attention is pulled toward the threat. That is adaptive over minutes and expensive over months, because the pull continues whether or not there is anything to attend to.
Word retrieval slows. The tip-of-the-tongue state becomes more frequent, and more so under observation — which is why it is worst in meetings and rarely a problem alone.
Decisions get harder and worse. Both the willingness to decide and the quality of the decision. Deferring decisions accumulates a backlog, which is itself stressful.
Sleep degrades, which then produces its own cognitive cost, which is why stress and sleep deprivation are usually the same problem in practice.
A background process runs continuously. Worry consumes capacity even when you are not consciously worrying. This is the part people find hardest to credit and that best explains why a "light" day can leave nothing at the end of it.
None of this is a metaphor and none of it is a matter of attitude. It is a real cost, and it is why someone under prolonged pressure can be genuinely, measurably less capable than they were, while having no other condition.
Why "just stress" is the wrong framing
Because it implies two things that are not true.
That it does not need addressing. Prolonged stress has cognitive, physical and mood consequences. Something that is degrading your working memory and your sleep for eighteen months is worth intervening in, even if it is not a disease.
That nothing else needs excluding. Stress is a diagnosis of plausibility, not of exclusion. It is entirely possible to be under great pressure and also have untreated sleep apnoea, low iron, an underactive thyroid, a depressive episode, or a long-standing attention difficulty that the pressure has made visible.
The honest position: stress is very likely contributing, and the common treatable contributors should still be checked. Asking for thyroid function, full blood count, iron and B12, and for a proper conversation about sleep, is entirely reasonable and not a sign of not accepting the explanation.
When it is probably a large part of the story
Some features point this way:
- The onset lines up with an identifiable, sustained pressure
- It improves noticeably during genuine breaks — a real holiday, a resolved crisis
- Sleep deteriorated around the same time
- The body is involved: tension, jaw clenching, digestive change, headaches
- Nobody has noticed a change in you beyond seeming stretched
- It is not progressing month on month
When to look further
- It has not improved despite the pressure lifting
- It is clearly progressive
- Others have noticed changes that go beyond looking tired
- Enjoyment has gone across the board, not just crowded out
- There is something focal: word-finding others remark on, getting lost, difficulty with long-familiar tasks
- Nothing has actually been checked
What helps, in rough order of effect
Unglamorous, and the order matters.
Reduce the load, if it is reducible. This is the intervention, and everything else is mitigation. It is also the one most often skipped in favour of coping techniques, sometimes because the load genuinely cannot be reduced and sometimes because the conversation required to reduce it is harder than the coping.
Sleep. The largest single lever, and the one most damaged by stress. Protecting sleep timing is worth more than almost anything else on this list.
Externalise everything. Under reduced working memory, trying to hold things in your head fails and the failures add stress. One list, one place, checked at a fixed time.
Reduce the number of live decisions. Batch them, make them at a fixed time, and make the small ones by default rather than by deliberation.
Physical activity, which has decent evidence for stress specifically and does not require enjoying exercise.
Genuinely undemanding recovery, which is not scrolling.
Specific psychological treatment, if this has become chronic. Treatment for stress-related difficulty is real, effective, and not reserved for crisis.
Alcohol, honestly. It is the most common self-treatment for this and it degrades sleep, which is where the recovery was going to happen.
What to say in an appointment
Do not lead with "it is probably just stress", because that is the conclusion and it will be accepted.
Lead with the observation:
Since about February I have been losing the thread mid-sentence and forgetting things I would normally hold. Work has been extremely pressured since then, so I suspect that is part of it. It did improve over a week off in August, which makes me think you are right. But I would like to know that my thyroid and iron are normal, and I now wake unrefreshed most days, which is new.
That is honest about the likely explanation, specific about the symptoms, and still asks for the things worth checking. It is also much harder to dismiss than either the symptom or the theory alone.