Why do I feel tired all the time? See your GP first, then look at what the tests cannot show

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Read this first

Feeling tired all the time needs a GP appointment first, because physical causes have to be ruled out. The NHS says to see a GP if you have felt tired for a few weeks and are not sure why, and it lists causes that a blood test can pick up, such as anaemia, diabetes and an overactive thyroid. Nothing in this article replaces that appointment, and nothing here will tell you which of those you do or do not have.

What this article is for is the other half of the question, the half most tiredness pages skip. A lot of people get the tests, the tests come back fine, and they are still exhausted. That is not nothing and it is not in your head. Stress, worry, low mood and poor sleep all leave people tired in ways a blood test cannot see, and the NHS names all of them as common causes of tiredness. If the exhaustion has crept up alongside a long stretch of pressure, how to recover from burnout is the fuller guide to that particular shape of tired, and this piece sits beside it.

What are the red flags for fatigue?

The NHS says to see a GP if tiredness has lasted a few weeks and you do not know why. The same page adds three more reasons to book: tiredness that affects your daily life, tiredness alongside other symptoms such as weight loss or mood changes, and being told that you gasp, snort or make choking noises in your sleep.

None of those is a diagnosis, and this article is not going to attempt one. The point is simpler. If any of those four fits, the first move is a GP, not a self-help list, and not a page like this one. The GP may arrange blood tests, which the NHS says can check for anaemia, diabetes and an overactive thyroid, and will ask about your sleep, your mood and what is going on in your life. If the cause is still not clear, they can refer you to a specialist.

The sections below are written for the person who has had that conversation, or is about to, and wants to understand the part of being tired that the tests do not measure.

What the NHS says can make you tired all the time

The NHS tiredness page names a short list of common causes, and most of them are ordinary. Not getting enough sleep, or finding it hard to get to sleep. A diet that is not doing you any favours and too little exercise. Stress, depression, bereavement, or caring for a new baby. Hormonal changes around puberty, pregnancy or the menopause. Illnesses such as glandular fever and COVID-19. The side effects of some medicines and treatments.

Look at that list again and notice how much of it is not a disease. Stress, bereavement, a new baby, low mood and bad sleep sit right alongside the physical causes, on the same NHS page, as reasons a person can be worn out for weeks. The NHS also lists a handful of conditions that need ruling out, including sleep apnoea, anaemia, diabetes, an overactive thyroid and ME/CFS, and tells readers not to try to diagnose themselves. Let the GP do that part. The rest of this article is about the half of the list you can actually do something with.

Can stress make you tired all the time?

Yes: the NHS lists stress as a common cause of tiredness and says stress uses up a lot of energy. The NHS stress page lists sleeping too much or too little, trouble concentrating, feeling overwhelmed and constant worry among the signs, and every one of those drains you by the end of the day.

Stress is also sneaky, because it rarely announces itself as stress. It shows up as a flat Sunday evening, a brain that will not switch off at 1am, a body that feels heavy on a day when nothing physical has happened. If your tiredness tracks your workload, your money worries or a difficult situation at home more closely than it tracks your sleep, that is worth noticing. The stress bucket is a useful way to picture how pressure builds and overflows, and if the exhaustion has been building for months under sustained pressure, the burnout symptoms test and the burnout guide linked above cover that ground, so this article will not repeat it.

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Low mood and the tiredness that comes with it

Low mood makes people tired, and the NHS says a low mood can leave you tired or struggling to sleep. On its depression page the NHS lists a lack of energy, disturbed sleep and little motivation or interest in things among the physical and psychological symptoms, which is why "tired all the time" and "I cannot be bothered with anything" so often turn up together.

The NHS draws one useful line here. A low mood often lifts after a few days or weeks, and the NHS suggests small changes, such as resolving something that is bothering you or getting more sleep. A low mood that lasts two weeks or more could be a sign of depression, and the NHS says to see a GP if you have symptoms of depression for most of the day, every day, for more than two weeks. If that sounds closer to where you are, low mood is the guide for it, and no motivation to do anything covers the flatness specifically. Please do not sit on it because it feels like "just tiredness". Mood changes alongside tiredness are one of the reasons the NHS gives for seeing a GP, not a reason to wait.

Why do I feel tired all the time even when I sleep enough?

Hours in bed and good sleep are not the same thing, and worry can wreck the second. The NHS insomnia page lists stress, anxiety and depression among the causes of poor sleep, and Mind describes a close relationship running both ways: living with a mental health problem can affect how well you sleep, and poor sleep can have a negative effect on your mental health.

Mind's sleep page also lists feeling tired or sleepy during the day as a sleep problem in its own right, which can come from not sleeping enough, not getting good quality sleep, or health problems. So "I sleep eight hours and I am still shattered" is a sentence worth taking to a GP as it stands, especially if a partner says you snore loudly or gasp and choke in the night, which the NHS lists as a reason to see a GP. If the problem is a racing mind rather than a snoring one, how to sleep with anxiety covers what to do at 2am.

What helps when the tests come back fine

Once a GP has ruled out the physical causes, the NHS self-help advice for tiredness is practical and unglamorous. Eat regular meals and healthy snacks every three to four hours rather than two big meals a day. Move a little, because the NHS says even a single 15-minute walk can give you an energy boost. Drink water, since mild dehydration can leave you tired. Cut back on caffeine, which the NHS says can affect the body for up to seven hours, and on alcohol, which makes sleep less deep.

On sleep itself, the NHS insomnia page and Mind agree on the basics: go to bed only when you are sleepy, get up at about the same time every day, do not nap, do not sleep in after a bad night, keep the room dark and quiet, and put screens down before bed. Mind suggests keeping a sleep diary for at least two weeks so you can see what is actually happening, and taking it to your GP if you want to.

Talking it through

Talking is the part most tiredness lists leave out. The NHS says talking therapy, such as counselling or CBT, might help fight tiredness caused by stress, anxiety or low mood, and that a GP can refer you. In England you can refer yourself to NHS Talking Therapies without seeing your GP. Wobble is a different shape of the same idea: you describe what is wearing you out, in text or a voice note, and a qualified UK therapist replies with a personal video, usually within hours. Therapists work to the Wobble response framework, a structured framework built for short, practical, single-response support, so the reply covers what they understood, practical guidance, and one clear next step. Wobble's Clinical Lead is James Penney, NCPS Accredited Psychotherapeutic Counsellor. It is not a diagnosis and it is not a substitute for the GP appointment above.

When to see your GP, and when it is urgent

See your GP if you have been tired for a few weeks and do not know why. Book the same appointment if the tiredness is affecting your daily life, if you have other symptoms alongside it, such as weight loss or changes in your mood, or if someone has told you that you gasp, snort or choke in your sleep. Those are the NHS's own reasons, and none of them requires you to have worked out the cause first.

On the mood side, the NHS says to see a GP if a low mood has lasted more than two weeks, if you are struggling to cope, or if what you are trying is not helping. For sleep, the NHS says to see a GP if changing your sleep habits has not helped, if you have had trouble sleeping for months, or if insomnia is making it hard to cope day to day.

Get urgent help if you are having thoughts of suicide or self-harm, or feel you cannot keep yourself safe. Call 999 or go to A&E if someone's life is at risk. Otherwise call NHS 111 and select the mental health option, or use 111 online. Samaritans are free to call on 116 123, day or night, and Shout is there by text on 85258 if talking feels like too much.

Who you can talk to today

The free routes come first, then your GP, then Wobble.

• NHS Talking Therapies (England): refer yourself at nhs.uk/talk without seeing your GP, for low mood, worry, anxiety and depression. Free. Waits vary widely.
• NHS 111, mental health option: call 111 and select the mental health option, or use 111 online, for urgent help that is not an emergency.
• Samaritans: call 116 123, free from any phone, 24 hours a day, 365 days a year.
• Shout: text SHOUT to 85258, free, confidential, 24/7.
• Mind: the Infoline on 0300 123 3393 for information and where to get help near you, and the support line on 0300 102 1234 if you want someone to listen, both weekdays 9am to 6pm in England and Wales.
• Your GP: for tiredness that has lasted a few weeks, is affecting your daily life, or comes with other symptoms. Elsewhere in the UK, your GP can also tell you what talking support is available locally.

Wobble is on-demand mental health support: you answer seven short questions about what is going on, add more in writing or by voice note if you want, and a qualified UK therapist records you a personal video with practical guidance, usually within hours. Your first Wobble is £9.99, usually £14.99. It is not a crisis service.

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Quick summary

Tiredness that will not lift needs a GP appointment first. The NHS says to book one if you have been tired for a few weeks and do not know why, if it affects your daily life, if you have other symptoms such as weight loss or mood changes, or if you gasp, snort or choke in your sleep. Blood tests can rule out anaemia, diabetes and an overactive thyroid. When the tests come back fine, the NHS puts stress, low mood, bereavement and poor sleep on the very same list of causes, and they are the part you can work on: regular meals, a short walk, water, less caffeine and alcohol, a steady wake time, screens down at night, and talking to someone, whether that is NHS Talking Therapies, your GP, or a therapist through Wobble. A low mood lasting more than two weeks is a GP conversation in its own right. You do not have to be sure what is wrong before you ask.

Sources and further reading

• NHS: Tiredness and fatigue
• NHS: Self-help tips to fight tiredness
• NHS: Stress
• NHS: Get help with low mood, sadness or depression
• NHS: Depression in adults, symptoms
• NHS: Insomnia
• NHS: Talking therapies
• NHS: Find NHS Talking Therapies for anxiety and depression
• NHS: Where to get urgent help for mental health
• Mind: Sleep and mental health
• Mind: Tips to improve your sleep
• Mind: Helplines
• Samaritans: Contact a Samaritan
• Shout: text SHOUT to 85258

This article is for information only and does not replace advice from a qualified medical professional. If you have been tired for a few weeks and do not know why, or if tiredness is affecting your daily life, please speak to your GP or contact NHS 111. If you are in crisis, please call 999 or go to A&E.