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If you are feeling tired all the time, the cause is most often found in everyday life: too little or poor-quality sleep, ongoing stress, irregular meals, too little movement, or too much caffeine and alcohol. Small changes in these areas usually help within a few weeks. If tiredness lasts longer than that, comes with other symptoms or has no obvious reason, see your GP, who can arrange blood tests to look for common causes such as low iron levels or thyroid problems.
This guide walks through the everyday causes one by one, shows what you can change, explains where nutrition fits in and lists the signs that mean tiredness needs a doctor.
In short
- Most ongoing tiredness has lifestyle causes such as sleep, stress, diet and activity levels.
- Adults generally need around seven to nine hours of sleep, and a regular bedtime matters as much as the number of hours.
- Regular meals with protein, wholegrains, fruit and vegetables help to keep energy steady through the day.
- Several vitamins and minerals, including vitamin B12, vitamin C and iron, contribute to the reduction of tiredness and fatigue.
- Tiredness lasting several weeks, or tiredness with weight loss, breathlessness or low mood, should be checked by a GP.
Why am I always tired?
Tiredness is one of the most common reasons people see a GP in the UK, and in most cases no serious illness is found. That does not mean the tiredness is imaginary. It usually means that several ordinary factors are adding up: a few short nights, a stressful month at work, skipped breakfasts and evenings spent on the sofa with a screen.
It helps to look at tiredness in layers. First come sleep and stress, then food and drink, then movement, and only then supplements and medical tests. Working through the layers in this order often reveals an obvious change you can make.
Are you getting enough good-quality sleep?
Most adults need between seven and nine hours of sleep a night, but quality matters as much as quantity. Going to bed and getting up at roughly the same time every day, including at weekends, helps your body clock settle. A cool, dark and quiet bedroom, and putting your phone away half an hour before bed, make it easier to fall asleep.
If you snore loudly, wake up gasping or feel unrefreshed however long you sleep, mention it to your GP. These can be signs of sleep problems that are worth investigating.
Could stress or low mood be the cause?
Worry, pressure at work, caring for children or older relatives and money problems can all leave you exhausted, even if you are physically doing very little. Stress affects sleep, appetite and motivation, which in turn adds to the tiredness.
Talking to someone you trust, taking short breaks during the day and making time for something you enjoy can help. If you have felt low, hopeless or lost interest in things for more than two weeks, speak to your GP. Tiredness is a common symptom of depression, and help is available.
How does food affect your energy?
Skipping breakfast, eating a large lunch and then reaching for biscuits in the afternoon is a common pattern that leaves many people flat by mid-afternoon. Regular meals that combine protein, wholegrain carbohydrates, fruit and vegetables release energy more evenly through the day. If the afternoon slump is your main problem, our article on the afternoon slump explains why it hits and what helps.
Drinking enough is also important, because even mild dehydration can make you feel tired and unfocused. Caffeine can mask tiredness for a while, but too much of it, especially after mid-afternoon, can disturb your sleep. Alcohol may help you fall asleep but makes sleep lighter and less refreshing in the second half of the night.
Some nutrients are directly linked to energy. Iron is needed to carry oxygen in the blood, and women with heavy periods, pregnant women, vegetarians and people who rarely eat red meat are more likely to have low iron levels. Our guide to iron-rich foods lists good sources for everyday meals.
Which everyday habits drain your energy?
The table below brings together the most common energy drains and simple changes to try for two to three weeks.
| Energy drain | Why it matters | What to try |
|---|---|---|
| Irregular sleep times | Your body clock cannot settle into a rhythm | Fixed bedtime and wake-up time, also at weekends |
| Screens late in the evening | Bright light and stimulating content delay sleep | Phone away 30 minutes before bed |
| Skipped meals | Long gaps lead to dips in energy and concentration | Three regular meals with protein at each one |
| Too little water | Mild dehydration can cause tiredness and headaches | A glass of water with each meal and a bottle on your desk |
| Caffeine after 3 pm | It can stay in the body for hours and disturb sleep | Switch to decaf or herbal tea in the afternoon |
| Little movement | Inactivity lowers fitness and makes everyday tasks more tiring | A brisk 20-minute walk most days |
| Winter darkness | Little daylight affects mood and sleep rhythm | Get outside in daylight, ideally in the morning |
Does exercise help when you feel exhausted?
It may sound strange, but regular movement usually makes people feel less tired, not more. Physical activity improves fitness, helps you sleep more deeply and lifts mood. You do not need a gym membership. A brisk walk at lunchtime, cycling to work or a dance class once a week all count.
Start gently if you have not been active for a while, and build up gradually. If even light activity leaves you exhausted for days afterwards, talk to your GP, because this needs a proper assessment.
Can vitamins and minerals help with tiredness?
Food should come first, but there are periods when a varied diet is hard to keep up, such as busy weeks, shift work or winter months with fewer fresh vegetables. Several nutrients have authorised health claims linked to tiredness. Vitamin B12, vitamin B6, vitamin C and iron, among others, contribute to the reduction of tiredness and fatigue.
If you want a simple daily top-up, there are a few LR options with clearly declared amounts. Vita Active Red Fruits is a liquid vitamin concentrate taken in a daily 5 ml portion. It provides 100% of the nutrient reference value of eight B vitamins, including B6 and B12, and vitamin B12 contributes to the reduction of tiredness and fatigue. It also contains 10 micrograms of vitamin D. Mind Master Formula Gold is a drink with a daily portion of 80 ml that provides iron (30% of the reference value) and vitamin B12, and iron contributes to the reduction of tiredness and fatigue. For the colder months, Aloe Vera Drinking Gel Immune Plus provides 80 mg of vitamin C, 10 mg of zinc and selenium in a daily 90 ml portion. Vitamin C contributes to the reduction of tiredness and fatigue, and zinc contributes to the normal function of the immune system.
These three products are shown below, and more options are in our supplements category:
Before you rely on a supplement, remember that it cannot replace sleep, rest or a medical check if your tiredness has a medical cause. If you take medicines or have a health condition, ask your pharmacist whether a supplement is suitable for you. In autumn and winter, it is also worth reading what UK guidance says about vitamin D in winter.
When should you see a doctor?
See your GP if you have felt tired for several weeks without an obvious reason, or if changes to sleep, diet and activity have not helped. Your GP may arrange blood tests to look for common causes such as low iron levels (anaemia), thyroid problems, diabetes, or low vitamin B12 or vitamin D levels. A review of your medicines can also be useful, because some medicines cause tiredness as a side effect.
The MSD Manual lists warning signs that need prompt medical attention when they occur together with tiredness:
- Weight loss that you cannot explain, a persistent fever or heavy night sweats.
- Swollen glands in several parts of the body, or muscle weakness.
- Shortness of breath, coughing up blood, or blood in vomit or stools, or black stools.
- Confusion, or thoughts of harming yourself.
If you have thoughts of harming yourself, contact your GP urgently, call NHS 111, or call Samaritans free on 116 123 at any time. In an emergency, call 999.
Frequently asked questions
Why am I tired even after eight hours of sleep?
The quality of your sleep may be poor, for example because of snoring, a late heavy meal, alcohol or screens before bed. Stress, low iron levels or a thyroid problem can also cause tiredness, so see your GP if it continues for several weeks.
What blood tests check for tiredness?
GPs often check a full blood count for anaemia, iron stores, thyroid function, blood sugar and sometimes vitamin B12 and vitamin D. Your GP will decide which tests make sense for your symptoms.
Can lack of vitamin D make you tired?
Low vitamin D levels are common in the UK in winter, and some people with low levels report tiredness. A blood test can show your level, and UK advice suggests considering a vitamin D supplement in autumn and winter.
Does coffee help with tiredness?
Coffee can help you feel more alert for a few hours, but it does not fix the cause of tiredness. Too much caffeine, especially later in the day, can disturb sleep and make you more tired the next day.
How long does it take to feel less tired after changing habits?
Many people notice a difference within two to three weeks of sleeping, eating and moving more regularly. If nothing changes after a month, see your GP.
Sources
- MSD Manual, consumer version (French edition): Fatigue
- European Commission: EU Register of nutrition and health claims
- EFSA: Health claims
Food supplements are not medicines and should not replace a varied, balanced diet and a healthy lifestyle. This article is general information and not medical advice.