If tiredness has lasted several weeks, is disrupting everyday life or has no clear explanation, arrange a GP appointment. You do not need to work out the cause before asking for help. Persistent fatigue deserves attention, particularly when other symptoms appear alongside it. The NHS recommends assessment in these situations. NHS: tiredness and fatigue
A useful starting point is a clear account of what has changed: waking exhausted, struggling through the afternoon or finding ordinary tasks unusually demanding. That account helps shape the next step.
When tiredness needs immediate help
Call 999 for sudden chest pain that persists, chest pain spreading to an arm, neck or jaw, or chest pain accompanied by sweating, sickness or breathlessness. Severe breathing difficulty, such as gasping or being unable to speak, also needs emergency help. Do not wait for a clinic appointment or complete an online questionnaire first. NHS: chest pain and NHS: shortness of breath
For ongoing fatigue, tell your GP about additional changes such as unexplained weight loss or gasping and choking during sleep. NHS: tiredness and fatigue
Why feeling exhausted can have different explanations
Sleep problems, stress and health conditions can contribute to tiredness. Possible medical explanations include anaemia, diabetes and thyroid problems. Similar experiences can therefore lead to different investigations and care plans; symptoms alone cannot identify a vitamin deficiency or justify an infusion. NHS: tiredness and fatigue
Notice whether activity causes a delayed worsening that lasts well beyond the activity itself. This pattern, called post-exertional malaise, matters when a clinician considers ME/CFS. NICE advises people with suspected ME/CFS against pushing through their symptoms. Mention the pattern rather than attempting to test your limits with extra exercise. NICE: ME/CFS recommendations
If concentration is also affected, our guide to brain fog, possible causes and assessment explains how to describe those changes.
Prepare a useful picture of your day
Brief notes can make the consultation easier. A few ordinary examples are more useful than a perfect diary. Consider recording:
- When the tiredness started, whether it fluctuates and anything happening around its onset.
- How sleep feels, including whether someone has noticed snoring or interrupted breathing.
- One everyday task that has become harder, such as preparing a meal or finishing a work shift.
- Any worsening after activity, including when it begins and how long it lasts.
- Your medicines, supplements, health conditions and previous test results.
Choose one priority to discuss: understanding the cause, managing daily demands or reviewing a previous finding. There is no need to delay an appointment to collect these notes.
What assessment and blood tests can cover
Assessment can bring together symptoms, medical history, examination and relevant investigations. When ME/CFS is suspected, NICE describes tests to investigate other explanations, including blood count, thyroid function, ferritin and blood glucose assessment. Additional testing depends on clinical judgement. This is a condition-specific assessment framework, not a shopping list for everyone who feels tired. NICE: investigating suspected ME/CFS
Before paying for testing, ask which question each test addresses, who will interpret the findings and what follow-up is included. HSMW describes its London blood-testing service and Glasgow blood-testing service; the appropriate selection still follows your individual assessment.
How Clear Focus can structure the next step
Clear Focus is HSMW's clinic pathway for discussing persistent fatigue and related concerns. Its portfolio starts with selected testing and metabolic review, followed by a clinician-agreed plan and review of the priorities you identified.
The wider portfolio includes optional NAD+ IV and specialist discussions about methylene blue, phospholipid exchange and EBOO. These are separate clinical decisions. Listing them does not mean they are necessary, suitable or proven to relieve your fatigue. Ask about evidence for your situation, risks, alternatives and the option of proceeding without an infusion.
The initial suitability tool organises your goals and proposed pathway. Its pathway-match score does not diagnose the cause, clear you for treatment or predict improvement. A personal target expresses what matters to you; it is not a forecast.
Explore the Clear Focus fatigue pathway in London or Clear Focus fatigue pathway in Glasgow to see the stages and request a protocol consultation.
Frequently asked questions
Can a blood test explain every case of fatigue?
No. Tests address particular clinical questions. Their results need to be considered alongside your symptoms and assessment; further review may still be needed.
Should I choose a drip before my appointment?
You can bring questions about treatments. A symptom or online score should not decide which treatment you receive; that decision requires an individual clinical discussion.
Can the tool tell me how much better I will feel?
No. It can help record your starting point and goals. Improvement, its extent and its timing cannot be calculated from the questionnaire.