Can Tiredness Cause Dizziness? Lightheaded and Tired

Feeling tired and dizzy at the same time is very common, and the two are closely linked. Tiredness can make you dizzy, dizziness can wear you out, and several common health problems cause both. Working out which is driving which is the key to feeling better.

This guide explains how tiredness and dizziness are connected, the conditions that cause both, what you can do and when to see a doctor.

When to see someone: call 999 if dizziness comes with chest pain, fainting, a sudden severe headache, weakness on one side or slurred speech. See your GP if tiredness and dizziness last more than two weeks, as a simple blood test can rule out causes such as anaemia. If the room spins when you move your head, or you feel off balance most days, a vestibular assessment can find the cause: see Vestibular First at our Chiswick clinic. Vertigo and BPPV assessment and treatment start from £50. Book online or call 020 4515 0000.

Quick answer

Yes, tiredness can cause dizziness. Lack of sleep slows how the brain processes balance signals, and being run down often goes with dehydration, skipped meals and lower blood pressure, all of which can make you light-headed. Dizziness can also cause fatigue, because inner ear problems make the brain work harder to keep you balanced. Common causes of both include anaemia, low blood pressure, dehydration, an underactive thyroid, recovery from a viral illness, anxiety and some medicines. If you feel tired and dizzy for more than a couple of weeks, see your GP.

How tiredness can make you dizzy

• Poor sleep affects balance. Your brain combines signals from your inner ears, eyes and body to keep you steady. When you are sleep deprived, that processing is slower, so you can feel woozy or unsteady.
• Tiredness often comes with dehydration and skipped meals, which lower blood pressure and blood sugar.
• Exhaustion lowers your tolerance to other triggers, such as standing up quickly, heat or alcohol.
• Lack of sleep can trigger vestibular migraine, a common cause of recurring dizziness.
• Existing balance problems feel worse when you are tired, because the brain has less capacity to compensate.

Conditions that cause both tiredness and dizziness

• Anaemia, often from low iron, which can also cause breathlessness and pale skin
• Low blood pressure and light-headedness on standing
• Dehydration, including after illness, heat or exercise
• Low blood sugar, and blood sugar swings in diabetes
• An underactive thyroid
• Recovery from a viral illness, including long COVID
• Postural tachycardia syndrome (PoTS), where the heart rate rises abnormally on standing
• Anxiety and depression, which commonly cause both, as well as poor sleep
• Medicines, including some blood pressure tablets, antidepressants, sedatives and antihistamines
• Pregnancy, especially in the early months
• Heart rhythm problems, which are less common but important if you also have palpitations or faint

Does vertigo make you tired? Dizziness and fatigue

Yes. When an inner ear problem such as vestibular neuritis, BPPV or PPPD disrupts balance, the brain has to work much harder to keep you upright and your vision steady. Many people describe feeling mentally and physically exhausted, especially in busy places. Dizziness can also disturb sleep, increase anxiety and lead you to move less, all of which add to fatigue. Treating the cause of the dizziness, usually with vestibular rehabilitation, often improves energy too.

Vertigo fatigue can be marked. After a severe attack, such as the first days of vestibular neuritis or labyrinthitis or an attack of Meniere's disease, many people feel extremely tired and want to sleep for hours. With BPPV, the spinning lasts seconds, but repeated episodes, nausea and broken sleep still wear you down. This tiredness usually eases as the balance system recovers. If it lingers for weeks after the vertigo has settled, or you feel dizzy and exhausted most days, it is worth being assessed. See how long vertigo lasts.

Tired, weak and dizzy: symptoms that point to a cause

The other symptoms you notice alongside tiredness and dizziness are often the best clue to what is behind them:

• Pale skin, breathlessness or a pounding heartbeat suggest anaemia.
• Thirst, a dry mouth and dark yellow pee suggest dehydration.
• Feeling cold, weight gain and constipation can point to an underactive thyroid.
• Shakiness, sweating and hunger that ease after eating suggest low blood sugar.
• Headaches, dizziness and tiredness together often come from poor sleep, dehydration, stress or migraine. See what causes headaches.
• Spinning when you move your head points to the inner ear rather than tiredness.

Weakness that affects one side of the body, rather than feeling generally weak and drained, is different and needs a 999 call.

What you can do

• Aim for regular sleep and wake times. See what insomnia is if sleep is a struggle
• Drink regularly through the day and eat regular meals
• Get up slowly, sitting for a minute before standing
• Keep gently active, as resting too much makes both fatigue and balance worse
• Limit alcohol and late caffeine
• Keep a diary of when dizziness happens, how you slept and what you ate
• Ask your GP or pharmacist whether any of your medicines could be contributing

What your GP may check

Your GP may check your blood pressure lying and standing, listen to your heart and arrange blood tests such as a full blood count, iron stores, thyroid function, vitamin B12 and blood sugar. An ECG may be done if you have palpitations or have fainted. If the dizziness is spinning or unsteadiness, a vestibular assessment can check for an inner ear cause.

When to seek medical help

Call 999 if dizziness and tiredness come with:

• Drooping of the face, weakness or numbness in an arm or leg, or slurred speech
• Chest pain, breathlessness, or a racing or irregular heartbeat
• Fainting where the person does not come round quickly
• A sudden, severe headache

Get same-day medical advice, from your GP or NHS 111, if:

• You faint, especially during exercise
• You have been vomiting or had diarrhoea and cannot keep fluids down
• You have very heavy bleeding, including heavy periods, with dizziness

See your GP if:

• Tiredness and dizziness last more than two weeks
• You also have weight loss, night sweats, breathlessness or very heavy periods
• Low mood or anxiety is part of the picture
• Symptoms started after a new medicine

Frequently asked questions

Can lack of sleep or exhaustion cause vertigo?

Lack of sleep and exhaustion do not cause inner ear conditions such as BPPV, but they can trigger vestibular migraine and make existing dizziness feel worse. True spinning vertigo that keeps coming back is worth having assessed rather than putting down to tiredness.

Can low iron make you dizzy and tired?

Yes. Iron deficiency anaemia is a common cause of both, particularly in women with heavy periods. A blood test can check.

Why do I feel dizzy and tired after eating?

Blood pressure can dip after a large meal, especially in older adults. Blood sugar swings after sugary meals can also cause tiredness and light-headedness.

Should I exercise if I feel tired and dizzy?

Gentle activity usually helps, but stop if you feel faint, and avoid exercise if you have chest pain or palpitations until you have seen a doctor.

Why do I feel lightheaded and tired all the time?

Feeling lightheaded and tired all the time is most often linked to poor sleep, not drinking enough, skipping meals, low iron (anaemia), low blood pressure, an underactive thyroid, anxiety or a side effect of a medicine. Several of these show up on simple blood tests, which your GP can arrange, or you can book a private blood test in Chiswick. See your GP if it has lasted more than a few weeks, and get urgent help if you faint, have chest pain, a racing or irregular heartbeat, or new weakness or slurred speech.

Dizziness assessment in Chiswick

Dizziness and balance problems are assessed at Omnia Lifestyle, 8 to 9 Bedford Corner, The Avenue, Chiswick W4 1LZ, close to Turnham Green station, on bus routes 94, E3 and 272. Limited parking is available on request when booking. Our Vestibular First service checks for inner ear causes and provides balance rehabilitation, with vertigo and BPPV assessment and treatment from £50, and home visits are available if you are too dizzy to travel. Our private blood tests in Chiswick need no GP referral and include an iron and ferritin test from £49, a thyroid test for £59 and the Tired All The Time blood test (43 biomarkers, £159). For persistent tiredness, our fatigue page explains the tests and support available.

Read more about balance and dizziness and fatigue, see why you may be tired all the time, why you may feel light-headed and vestibular rehabilitation for chronic dizziness, explore Vestibular First, physiotherapy and home visits, or book an assessment.

This article is general information, not medical advice. If you have any of the warning signs listed above, seek medical attention.