Health Pulse Insights
Why am I always tired? GP records show no clear cause for more than half of people tested
DocTap analysed 703 GP appointments about tiredness. Among the 403 where DocTap test results came back, no clear cause was recorded in 57%, and more tests or a referral were being arranged in another 23%. Low iron stood out in women, and poor sleep, stress and recent illness ran through the notes.
More than half of people with tiredness who had DocTap tests had no clear cause recorded, according to DocTap’s analysis of 703 GP appointments between June 2025 and September 2026.
Among the 403 appointments where DocTap test results came back, the GP recorded no clear cause in 57%. In another 23%, the GP was arranging more tests or a specialist referral to find one. Most of the rest had a specific explanation recorded, most often low iron in women.
That doesn’t mean nothing was wrong, or that testing wasn’t worthwhile. Tests helped rule out common physical causes and found treatable ones, such as low iron in 1 in 7 women tested. And the notes suggest why a single answer is often elusive: tiredness was often tangled up with poor sleep, stress, recent illness or low mood, sometimes several at once.
Key findings
The numbers at a glance
of appointments with DocTap test results had more tests or a specialist referral being arranged to find a cause.
of women tested had low iron or iron-deficiency anaemia recorded as the explanation.
of appointments described poor, short or broken sleep.
recorded a recent infection or illness alongside the tiredness.
For most tested appointments, no clear cause was recorded or more tests were being arranged
What the GP recorded as the explanation, appointments where DocTap test results came back, June 2025 to September 2026
Show the figures as a table
| By the end of this consultation and any results review, what explanation for the tiredness did the GP record? | By the end of this consultation and any results review, what explanation for the tiredness did the GP record? |
|---|---|
| No clear cause found | 57% (231 of 403) |
| Further tests or a specialist referral arranged to find the cause | 23% (94 of 403) |
| Low iron or iron-deficiency anaemia | 9% (35 of 403) |
| Low vitamin D, B12 or folate | 6% (25 of 403) |
Source: DocTap GP consultation records. No clear cause recorded means the GP recorded no specific explanation by the end of the consultation and any results review. It is not a final diagnosis, and it does not mean no cause exists. More than one explanation could be recorded, so the bars do not add up to 100%.
The main finding
Why so many people leave without a clear answer
Tiredness is one of the most common reasons people see a GP: a review cited by NICE Clinical Knowledge Summaries estimated that 5 to 10% of primary care appointments are directly related to fatigue. It is also one of the hardest to pin down. In a large Dutch primary care study cited by NICE, no specific cause was found for about one-third of people with fatigue.
In DocTap’s records, no clear cause was recorded for 57% of tested appointments, and more tests or a referral were being arranged for another 23%. This describes what the GP wrote by the end of the consultation and any results review, not a final diagnosis.
It was much the same at every age from 18 to 49: no clear cause was recorded for 58% of tested appointments for 18–29-year-olds, 58% for 30–39s and 55% for 40–49s. It was more common for men (63%) than women (53%), partly because low iron was recorded so much more often for women.
GPs kept the door open. Across all 703 appointments, 80% were told when to come back or seek help, and 50% had a follow-up appointment arranged.
Low iron in women
When tests do find something
Most blood test results were within the laboratory range, including 97% of thyroid results and 98% of blood sugar (HbA1c) results. That helps rule out some common causes, which is useful in itself.
The clearest physical finding was low iron. Among appointments with DocTap test results, low iron or iron-deficiency anaemia was recorded as the explanation for 33 of 229 women and fewer than 5 of 174 men. Heavy periods were described for 17% of women in the study, and the NHS identifies heavy periods and pregnancy as very common causes of iron-deficiency anaemia.
A normal iron stores (ferritin) result doesn’t always rule out low iron, because the laboratory range’s lower limit is below the level GPs often treat as low iron stores. Low vitamin D, B12 or folate was recorded as the explanation for 6% of tested appointments.
Low iron was recorded far more often for women
Low iron or iron-deficiency anaemia recorded as the explanation, appointments with DocTap test results
Show the figures as a table
| By the end of this consultation and any results review, what explanation for the tiredness did the GP record? | Women | Men |
|---|---|---|
| Low iron or iron-deficiency anaemia | 14% (33 of 229) | fewer than 5 of 174 |
Source: DocTap GP consultation records. Shares of women and men with DocTap test results. Low iron was recorded for fewer than 5 men, too few to show as a bar.
Sleep, stress and everyday life
Tiredness rarely travels alone
The consultation notes paint a fuller picture. Poor, short or broken sleep was described in 34% of appointments, a recent infection or illness in 28%, stress or a difficult life event in 26%, and low mood or anxiety in 19%. These were often recorded together.
They are what GPs wrote down, not established causes, and they are not population estimates: sleep wasn’t mentioned at all in 59% of notes. GPs rarely recorded them as the explanation for the tiredness itself. When several things are going on at once, it can be hard to point to any one of them as the cause.
Besides sleep, recent illness, stress, and alcohol or caffeine were recorded most often
Factors recorded alongside tiredness, all appointments
Show the figures as a table
| Which everyday factors that can cause tiredness did the notes record? | Which everyday factors that can cause tiredness did the notes record? |
|---|---|
| A recent infection or illness | 28% (194 of 703) |
| Stress or a difficult life event | 26% (181 of 703) |
| Alcohol or caffeine | 26% (184 of 703) |
| Work or study pressure, or long hours | 20% (141 of 703) |
| Restricted or vegetarian diet, or irregular meals | 15% (102 of 703) |
| Caring for a baby, children or another person | 7% (52 of 703) |
Source: DocTap GP consultation records. More than one factor could be recorded. These are mentions in consultation notes, not causes. Poor sleep was asked about separately, so it is not shown here.
“People often expect a blood test to explain why they're exhausted. But tiredness isn't always that straightforward. Our findings show that even after testing, there may be no single clear answer. That doesn't mean nothing is wrong, it means we need to look at the whole picture, including sleep, stress, recent illness and physical health.”
If you’re always tired
- See a GP if you have felt tired for a few weeks without knowing why, if it affects daily life, or if you have other symptoms such as weight loss or changes in mood, as the NHS advises.
- Tell them the whole picture: sleep, stress, work, caring, recent illness, mood and other symptoms. Several things can matter at once.
- Ask what your results mean. A result within the laboratory range and a full explanation for your tiredness are not the same thing.
- If there’s no clear answer, ask about the follow-up plan and when to come back. Uncertainty doesn’t make your tiredness any less real.
About the testing
Who was tested
403 of 703 appointments had DocTap test results from that appointment, and a further 4% were tested at a later DocTap visit. For 11%, the GP advised tests that weren’t done with DocTap, and 28% had no tests ordered with DocTap. Tests include those the GP ordered and those booked with the appointment, such as a health screen. Findings about explanations use the appointments with DocTap test results.
For journalists
About this research
Who carried out this research?
DocTap, a UK private GP service, analysed its own anonymised GP appointment records. A DocTap GP reviewed the report before publication.
What was analysed?
703 adult GP appointments where tiredness was one of the reasons for the visit, between June 2025 and September 2026. A few people had more than one appointment. AI read the consultation notes to identify what was recorded, with automated cross-checks and a second independent reading of a sample; test results and prescriptions come directly from clinical records.
What does ‘no clear cause recorded’ mean?
That by the end of the consultation and any results review, the GP had not recorded a specific explanation for the tiredness. It is not a final diagnosis, and it does not mean nothing was wrong. Care that happened elsewhere afterwards is not included.
Is this representative of the UK?
No. These are people who chose a private GP appointment, and the data is observational. It shows what GPs recorded, not what causes tiredness.
Can I use these figures?
Yes. Please credit DocTap and link to this page. The full figures are available to download below.
How we did this
Which appointments. We started from the 952 DocTap GP appointments between June 2025 and September 2026 where a reason for the visit was recorded as fatigue & tiredness, anaemia, vitamin & mineral deficiencies, other general symptoms or thyroid conditions, raised as a new concern, for adults aged 18 and over recorded as male or female. Reading their notes, we kept the 703 where the answer to "Was tiredness, fatigue or lack of energy one of the patient's reasons for this appointment, either the main reason or alongside another concern?" was yes. Figures count appointments, not people in the wider population.
How we analysed them. We analysed 703 GP consultation records, using AI to read the doctors' notes with automated cross-checks; test results and prescriptions come directly from our clinical records.
Limits. People who book a private GP are not a cross-section of the UK, and notes record what came up in the appointment, not everything about a person. Where a group has fewer than 20 people, we show the count rather than a percentage. To protect privacy, we don't publish a count of 1 to 4 people, or the size of a group of 1 to 4: these read "fewer than 5".
Using these figures
Media enquiries and questions about these figures: press@doctap.co.uk. Please credit DocTap and link to this report when reusing these figures.