Why Am I Tired All the Time? What Actually Causes It
By Paul Butler · Online Coach & Personal TrainerAt some point in this country, "tired" stopped being a state and became a personality. Ask anyone how they are and you will get it back like a surname.
So let me answer it properly, because why am I tired all the time is a question with real answers and most of them are not a supplement. Some of it is sleep, food and movement, and you can fix that yourself. Some of it is a blood test, and no powder on earth will touch it. Knowing which is which is the whole job.
See a GP if you have been feeling tired for a few weeks and you are not sure why, if your tiredness affects your daily life, if you feel tired and have other symptoms, such as weight loss or mood changes, or if you have been told you are making gasping, snorting or choking noises when you are asleep.
That last one is sleep apnoea, it is common, and it is very treatable. No amount of discipline fixes it.
Why am I tired all the time?
Usually a stack of ordinary things rather than one dramatic one: not enough sleep, stress, a diet that is not feeding you properly, and not much movement. Underneath those sit the medical causes, which are less common but much more worth ruling out, because no change to your routine will touch them.
| What might be behind it | Whose job |
|---|---|
| Not enough sleep, or trouble getting to sleep | Yours, and the first place to look |
| Stress, low mood, or dealing with something hard | Yours, often with help |
| Eating badly and not moving much | Yours, and the bit I can help with |
| Hormonal changes, including the menopause | A GP |
| Iron deficiency anaemia | A GP, and a blood test |
| Thyroid, over or under active | A GP, and a blood test |
| Diabetes | A GP, and a blood test |
| Sleep apnoea | A GP |
That list is the NHS's, not mine. Read the right hand column and notice how many of them end with somebody taking blood out of your arm.
The bit the fitness industry would rather you skipped
If you have been flat for weeks and you do not know why, the first useful thing you can do costs nothing and involves no shopping. Go and get checked.
"See a GP if: you've been feeling tired for a few weeks and you're not sure why, your tiredness affects your daily life..."
I say this because tired people are the easiest people in the world to sell something to. I have seen people spend nearly three hundred pounds on powders and potions before admitting they sleep five hours a night and drink almost no water. It is a bit like fitting carbon fibre spoilers to a car that has run out of petrol. Technically you have upgraded something. Just not the bit that matters.
Low iron will not care how good your greens powder is. Nor will an underactive thyroid. A blood test rules those out in a fortnight and then you know what you are dealing with.
The four boring things, in order
Assuming nothing medical has turned up, this is where the energy actually comes from. Get your house in order before anything clever.
- Sleep, and the amount of it. Not the tracker score, the hours. If you are regularly under six, nothing below will rescue you, and the eight hour rule is less fixed than you think but the direction is not.
- Eating enough, and enough protein. A lot of tired people are simply under-fuelled by four in the afternoon. Skipping breakfast then wondering why half three is a struggle is not a mystery.
- Movement every day, not training three times a week. Steps are the one that surprises people. Sitting still all day is tiring in a way that nobody warns you about.
- Caffeine and alcohol, honestly assessed. Coffee after about two in the afternoon and a couple of glasses in the evening will both show up in how you feel tomorrow, whatever you tell yourself.
None of that is exciting and all of it works. Which is annoying, and also the point.
Should you train when you are already shattered?
Usually yes, and usually less than you think. This is the bit people get wrong in both directions.
If you are run down rather than ill, a short session almost always leaves you better than the sofa did. Not a session that empties you. A walk, or twenty minutes of something steady. The rule I use with clients is that you should finish feeling like you could do it again tomorrow.
What does not work is going at it hard three nights a week on five hours sleep and expecting to feel good. That is not discipline, it is digging. If all you can manage is ten minutes, do the smallest possible version of it and go to bed.
When it is not a lifestyle problem
Some tiredness is not about habits at all. Low mood and anxiety are genuinely exhausting, and no amount of step counting addresses the cause. Long-term conditions, medication and recovery from illness all do the same thing.
If you have had a proper look at sleep, food and movement for a few weeks and nothing has shifted, that is information. Go back to your GP and say exactly that. This is general information and not medical advice, and tiredness that will not budge deserves a doctor rather than a blog.
Frequently asked questions
What blood tests should I ask for if I am tired all the time?
That is your GP's call rather than mine, and it depends on your history. What I would say is go in with the specifics: how long, how bad, what else has changed. "I am tired" gets a shrug. "I have been flat for two months, I am sleeping seven hours and it is affecting my work" gets a blood form.
Will a supplement help with tiredness?
Only if you are short of something, which is worth finding out rather than guessing. Vitamin D over a British winter is reasonable. Beyond that, most energy supplements are caffeine with a better logo, and caffeine borrows energy rather than making it.
Why am I tired even after a full night's sleep?
Time in bed and quality of sleep are different things. Broken sleep, late alcohol and sleep apnoea all leave you with eight hours on paper and nothing in the tank. If someone has told you that you snore or stop breathing at night, that is the first thing to mention to a GP.
Can exercise make tiredness worse?
Too much of it, yes, particularly on not enough food or sleep. The fix is rarely stopping altogether. It is doing less, more often, and eating properly around it. If light activity consistently floors you for days afterwards, that is worth raising with a GP rather than pushing through.
That is usually sleep, food and movement pulling in different directions, and it is fixable with a plan rather than a purchase. See how online coaching works, or book a free 15-minute call and tell me what your week actually looks like.
Want to start on your own? DM me STARTING on Instagram @paulbutler.coach and I will send you The Starting Point: five days of the fundamentals, then a four week plan built round your real week. No cost, no catch.
This article is general information, not medical advice. Tiredness lasting more than a few weeks, or tiredness with other symptoms, needs a GP rather than a blog.
More honest guides on fat loss, nutrition and training
The list of causes and the when-to-see-a-GP wording are from the NHS tiredness and fatigue page, quoted and linked in the text. Images from Pexels (free to use): Ann Tarazevich, Ketut Subiyanto, Teodor Olei.
