Everyone feels tired sometimes. Tiredness that lingers is different, and it is one of the most common reasons people book a doctor's appointment. This guide lists the usual causes, what you can try at home, and the signs that mean a check-up is due.
Normal tiredness versus fatigue that lingers
NHS Wales says it is normal to feel tired sometimes. The Leicestershire Partnership NHS Trust notes that exhaustion that goes on for a long time is not normal. It advises seeing a GP if you have felt constantly tired for more than four weeks, so a medical cause can be confirmed or ruled out.
A doctor usually looks at three areas: psychological, physical and lifestyle causes. The NHS trust says psychological causes are much more common than physical ones, and most lead to poor sleep or insomnia, which then causes daytime tiredness.
Common causes
Sleep
Not getting enough sleep, or finding it hard to fall asleep, tops the NHS list. NHS Wales advises regular sleep times and 6 to 9 hours of sleep. If you wake unrefreshed, snore loudly or gasp at night, ask about sleep apnoea, which can disrupt sleep without you noticing.
Stress, low mood and anxiety
These often show up as tiredness first. If low mood or worry is part of the picture, speak to your doctor. The cortisol regulation guide covers daily habits that help.
Medical conditions
NHS Wales lists sleep apnoea, iron deficiency anaemia, an overactive thyroid and ME/CFS among the conditions that can cause fatigue. Leicestershire's NHS trust adds an underactive thyroid. A primary care service lists low iron and vitamin B12, diabetes and post-viral fatigue among causes your doctor can test for. These cannot be sorted out by guessing, so get blood tests if tiredness persists.
Lifestyle
Alcohol, caffeine, night shifts, daytime naps and little exercise are the main lifestyle causes the NHS trust names.
What to try at home
Start with sleep, which is where NHS Wales begins.
- Keep the same sleep and wake times, aiming for 6 to 9 hours
- Relax for a couple of hours before bed with a book or a podcast
- Avoid heavy meals, caffeine and exercise in the two hours before sleep
- Keep screens away for the last hour
The fast sleep methods and evening wind-down habits add detail. In the morning, sunlight and circadian light timing helps set your body clock.
Eating for steady energy
The NHS urges a balanced diet and regular exercise to combat fatigue. In practice that means regular meals with protein, fiber and slow carbohydrates, so energy does not spike and crash. The guide to flattening blood sugar spikes with food sequencing and a protein-rich breakfast for focus are good starting points. Drink enough water, as in the importance of hydration. Test before you supplement, and read best vitamins for energy and focus with your results in hand.
When to see a doctor
NHS Wales says to see a GP if tiredness affects your daily life. Do not wait if you also have weight loss, mood changes, or signs of sleep apnoea. Extreme fatigue lasting at least three months, with memory and concentration problems, may point to ME/CFS. Tell your doctor which medicines you take, since some cause drowsiness.
Fatigue FAQ
Can low iron make me tired?
Yes. Iron deficiency anaemia is on the NHS list of conditions that cause fatigue. A blood test confirms it.
Do energy drinks help?
They may give a short lift but can disturb sleep, which makes tiredness worse. The NHS trust names caffeine among lifestyle causes.
How long should I wait before seeing a doctor?
The NHS trust suggests seeing a GP if you have been constantly tired for more than four weeks.
Fix sleep first, then check the rest
Start with sleep, food and movement for two to four weeks. If tiredness does not lift, book blood tests. Do not self-diagnose.
This post is for information and is not medical advice.
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