Tiredness and fatigue (2024)

It's normal to feel tired sometimes. But if you're tired all the time and do not know why, it could be a sign of a problem.

Causes of tiredness and fatigue

Common causes of tiredness and fatigue include:

  • not getting enough sleep or finding it hard to get to sleep (insomnia)
  • an unhealthy lifestyle (such as having an unhealthy diet and not getting much exercise)
  • stress, depression and dealing with life challenges, such as bereavement or looking after a new baby
  • hormonal changes (such as during puberty, pregnancy or the menopause)
  • some illnesses, like glandular fever and COVID-19
  • some medical treatments and medicines, like chemotherapy, which can cause drowsiness for a while

But if you cannot explain why you're tired and it's been going on for a while and not getting any better, it may be a sign of a medical condition.

Your symptoms might give you an idea of what's causing your tiredness or fatigue. But do not self-diagnose – see a GP if you're worried.

Conditions that can cause tiredness and fatigue
Symptoms Possible cause

Tired during the day because of waking up at night, making gasping, snorting or choking noises at night and loud snoring

Sleep apnoea

Lack of energy, noticeable heartbeats (heart palpitations), shortness of breath and pale skin

Iron deficiency anaemia

Very tired, feeling very thirsty, peeing more often than usual (particularly at night), weight loss

Diabetes

Tired all the time, finding it hard to stay still, feeling nervous, anxious and irritable, muscle weakness

Overactive thyroid (hyperthyroidism)

Extreme fatigue for at least 3 months (making it very hard to do daily activities), problems with thinking, memory and concentration, flu-like symptoms

Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)

Things you can do to help with tiredness or fatigue

There may be things you can do to help with your tiredness or fatigue.

Do

  • have a healthy diet and exercise regularly

  • try to stick to the same sleep times and aim for 6 to 9 hours of sleep

  • try to relax a couple of hours before your sleep time (read, or listen to music or a podcast)

  • have a relaxing sleeping area (not too bright, noisy or warm)

Don’t

  • do not smoke

  • do not drink too much alcohol

  • do not eat, have caffeine or exercise in the couple of hours before sleep

  • do not use smartphones or screens in the hour before sleep

More information

Non-urgent advice: 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
  • you feel tired and have other symptoms, such as weight loss or mood changes, or you've been told you're making gasping, snorting or choking noises when you're asleep

Treatment for tiredness or fatigue

Treatment for tiredness or fatigue depends on the cause.

Possible treatments include:

A GP may refer you to a specialist if they do not know the cause of your tiredness or fatigue.

You may need tests, such as blood tests to check for anaemia, diabetes or hyperthyroidism.

Page last reviewed: 02 June 2023
Next review due: 02 June 2026

Tiredness and fatigue (2024)

FAQs

Why am I so tired and have no energy? ›

Many cases of tiredness are due to stress, not enough sleep, poor diet and other lifestyle factors. Try these self-help tips to restore your energy levels. If you feel you're suffering from fatigue, which is an overwhelming tiredness that isn't relieved by rest and sleep, you may have an underlying medical condition.

What is the main cause of fatigue and tiredness? ›

Causes of tiredness and fatigue

an unhealthy lifestyle (such as having an unhealthy diet and not getting much exercise) stress, depression and dealing with life challenges, such as bereavement or looking after a new baby. hormonal changes (such as during puberty, pregnancy or the menopause)

How to treat fatigue and tiredness? ›

Try to eat regularly to maintain your energy levels throughout the day. Eat a healthy diet – increase the amount of fruit, vegetables, wholegrain foods, low fat dairy products and lean meats in your diet. Reduce the amount of high fat, high sugar and high salt foods. Don't overeat – large meals can drain your energy.

What is the difference between fatigue and tiredness? ›

For many people, fatigue is caused by a combination of lifestyle, social, psychological and general wellbeing issues rather than an underlying medical condition. Although fatigue is sometimes described as tiredness, it is more severe than being tired at the end of a long day or from hard physical exercise.

What are the red flags for fatigue? ›

Red flags, which may point towards serious underlying pathology, include constitutional symptoms (unintentional loss of weight, loss of appetite, fever), recent onset in a previously well older patient, unexplained lymphadenopathy and abnormal bleeding.

What are four warning signs of fatigue? ›

Fatigue often occurs along with other symptoms, such as:
  • Depression and lack of desire to do the activities you once enjoyed.
  • Trouble concentrating or focusing.
  • Very low energy and motivation.
  • Nervousness, anxiety and irritability.
  • Muscle pain and weakness.

What deficiency causes tiredness and fatigue? ›

Vitamin and mineral deficiencies, including B2, B3, B5, B6, B9, B12, C, D, iron, and magnesium, are among the most common causes of unexplained fatigue. Vitamin D deficiencies affect over 50% of the global population, and approximately 12.5% have iron deficiency anemia.

What illnesses start with fatigue? ›

Fatigue can also occur with the following illnesses:
  • Addison disease (a disorder that occurs when the adrenal glands don't produce enough hormones)
  • Anorexia or other eating disorders.
  • Arthritis, mainly adult or juvenile rheumatoid arthritis.
  • Autoimmune diseases such as systemic lupus erythematosus.
  • Cancer.
  • COVID-19.
  • Diabetes.

At what age do you start feeling tired and old? ›

Well, this depends on a person's age, health, fitness level and lifestyle. Generally, the more years that pass, the more you'll value your beauty sleep, and its true senior fatigue is a real thing. However, most people start experiencing a decline in their energy levels by the time they reach their mid-thirties.

What vitamins help tiredness? ›

If you lead an active lifestyle, or you just need an energy boost, both Vitamin B12 and Iron can help reduce feelings of tiredness and fatigue. Or if you need to sustain your mental alertness and concentration, Ginseng can support your mental wellbeing.

What is the best drug for fatigue? ›

Drug Therapies

Antidepressants often prescribed for chronic fatigue include: Tricyclics: amitriptyline (Elavil), desipramine (Norpramin), notriptyline (Pamelor) Selective serotonin reuptake inhibitors (SSRIs): citalopram (Celexa), escitalopram (Lexapro), fluoxetine (Prozac), paroxetine (Paxil), sertraline (Zoloft)

Why do I feel so old and tired? ›

There are plenty of potential culprits. Medications for blood pressure, sleep problems, pain and gastrointestinal reflux can induce fatigue, as can infections, conditions such as arthritis, an underactive thyroid, poor nutrition and alcohol use. All can be addressed, doctors say.

Why am I so tired and no energy? ›

Not getting enough sleep is one reason why you may be tired. Other possible reasons include nutrient deficiencies, stress, an underlying health condition, and drug side effects. If you have chronic fatigue, see a doctor for a diagnosis. If you're feeling overly tired or have little energy, you're not alone.

Should I keep sleeping if I'm tired? ›

In one study, researchers actually found that longer sleep time was associated with higher fatigue in people with severe insomnia. We often assume that if we're feeling fatigued then we should sleep more. In fact, the amount of time spent sleeping is not as important as the quality of sleep achieved.

When is fatigue worrisome? ›

If that's the case, or your fatigue gets worse or lasts longer than a week or two, it's time to see your doctor. Your fatigue might be related to an underlying illness or infection, especially if it's accompanied by symptoms, such as a low-grade fever, shortness of breath, or loss of appetite.

What is my body lacking if I feel tired? ›

Nutrient deficiencies

Vitamin and mineral deficiencies, including B2, B3, B5, B6, B9, B12, C, D, iron, and magnesium, are among the most common causes of unexplained fatigue. Vitamin D deficiencies affect over 50% of the global population, and approximately 12.5% have iron deficiency anemia.

Why do I feel tired, lazy, and unmotivated all the time? ›

The following factors can contribute to fatigue, either alone or in combination: Psychological and psychosocial – stress, anxiety, and depression. Physical – anemia, diabetes, glandular fever, and cancer. Physiological – pregnancy, breast-feeding, inadequate sleep, and excessive exercise.

Why does my body feel weak and tired? ›

Fatigue may be caused by simple factors like a lack of sleep or coming down with a cold or the flu. However, it can also be caused by underlying health conditions. In most cases, fatigue can be remedied by lifestyle or dietary modifications, correcting a nutrient deficiency, or treating an underlying medical condition.

What is crashing fatigue? ›

Menopause fatigue is often referred to as 'crushing'. It's a feeling of overwhelming, sudden 'crashing' tiredness, something akin to how we feel when we're coming down with a virus - a feeling of being drained, not being able to concentrate or keep your eyes open, and something that doesn't improve with sleep.

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