We all feel tired occasionally. A late night, a demanding week at work, family responsibilities or a disrupted routine can leave anyone wanting an early night.
But what happens when you are feeling tired all the time, even after resting?
Persistent fatigue can be frustrating and may begin to affect your concentration, mood, work performance, exercise, family life and general wellbeing.
Sometimes the explanation is relatively straightforward, such as inadequate sleep, stress, poor nutrition or an overly demanding lifestyle. In other cases, persistent tiredness can be associated with an underlying medical condition, including iron deficiency anaemia, thyroid problems, diabetes, sleep disorders or vitamin deficiencies.
If your tiredness has been continuing for several weeks, is getting worse or is interfering with your everyday life, it is sensible to speak to a doctor rather than simply trying to push through it.
At Niva Medical Clinic in Stanmore, our Private GPs can assess persistent fatigue, discuss possible causes and arrange appropriate blood tests or further investigations where clinically indicated.
What Is Fatigue?
Fatigue is more than simply feeling sleepy.
It can be described as a persistent feeling of physical or mental exhaustion, reduced energy or lack of motivation that does not always improve after rest.
Some people experience primarily physical fatigue. They may feel weak, heavy or unable to complete activities they previously managed comfortably.
Others notice more cognitive symptoms, sometimes described as “brain fog”, including:
- Difficulty concentrating
- Reduced attention
- Forgetfulness
- Slower thinking
- Poor motivation
- Difficulty making decisions
Fatigue itself is a symptom rather than a diagnosis.
The important question is therefore not simply whether you are tired, but why you are tired.
Why Am I Feeling Tired All the Time?
There are many potential causes.
Lifestyle factors are common, but ongoing fatigue can also be associated with physical or psychological health conditions.
A doctor will usually consider the broader picture, including:
- Your sleeping pattern
- Diet and hydration
- Stress levels
- Exercise
- Work and family demands
- Alcohol and caffeine consumption
- Current medication
- Other symptoms
- Existing medical conditions
- Recent illnesses
- Changes in weight or appetite
The duration and pattern of the fatigue can also provide useful clues.
For example, feeling exhausted following a particularly demanding period may have a different explanation from tiredness that has gradually worsened over several months.
Common Lifestyle Causes of Fatigue
1. Not Getting Enough Sleep
Poor sleep is one of the most obvious causes of tiredness, but it is also one of the most frequently overlooked.
Adults differ in how much sleep they need, but consistently getting too little sleep can affect energy, concentration, mood and physical performance.
The problem is not always simply the number of hours spent in bed.
Sleep quality matters too.
You might spend eight hours in bed but still wake feeling exhausted if your sleep is repeatedly interrupted.
Factors that can interfere with good-quality sleep include:
- Irregular sleeping hours
- Working late
- Shift work
- Young children waking during the night
- Stress and anxiety
- Excessive screen use before bedtime
- Caffeine late in the day
- Alcohol
- Pain
- Snoring or breathing difficulties during sleep
If you regularly wake feeling unrefreshed despite apparently getting enough sleep, it may be worth discussing this with a GP.
2. Stress and Burnout
Stress causes genuine physical as well as psychological effects.
When you are dealing with ongoing work pressures, financial worries, caring responsibilities, relationship difficulties or other demands, your body can remain in a prolonged state of heightened alertness.
Over time, this can contribute to exhaustion.
Signs that stress may be contributing to your fatigue include:
- Feeling mentally overwhelmed
- Difficulty switching off
- Irritability
- Poor concentration
- Headaches
- Muscle tension
- Changes in appetite
- Difficulty sleeping
- Feeling exhausted despite not doing strenuous physical activity
Persistent stress can also interact with other problems. For example, stress can disturb sleep, which then increases daytime fatigue and makes stressful situations harder to manage.
3. Poor Diet
Food provides the energy and nutrients your body needs to function properly.
Skipping meals, relying heavily on highly processed foods or following a restrictive diet without appropriate planning may contribute to low energy.
Potential dietary factors include:
- Not eating enough
- Irregular meals
- Inadequate protein
- Low iron intake
- Low vitamin B12 or folate
- Excessive refined carbohydrates
- Restrictive dieting
- Heavy alcohol consumption
Diet alone should not automatically be assumed to be responsible for persistent fatigue.
If your tiredness continues despite eating well, further investigation may be appropriate.
4. Dehydration
Even relatively mild dehydration can leave some people feeling tired, sluggish or unable to concentrate effectively.
Your fluid requirements vary depending on factors such as activity level, temperature, health and diet.
Someone who is very busy can easily go for long periods without drinking adequately.
If you frequently experience headaches, dry mouth, dark urine or reduced concentration alongside tiredness, hydration is worth considering.
However, persistent excessive thirst, particularly when associated with increased urination, should be discussed with a doctor because it can be associated with conditions such as diabetes.
5. Being Too Inactive
When you feel tired, exercise may be the last thing you want to do.
However, prolonged inactivity can sometimes contribute to feeling more sluggish.
Regular physical activity supports cardiovascular fitness, muscle strength, sleep and general wellbeing.
This does not mean someone experiencing unexplained or severe fatigue should suddenly begin an intensive exercise programme.
If your energy levels have changed significantly or physical activity is causing symptoms such as chest pain, dizziness or unusual shortness of breath, speak to a doctor before substantially increasing exercise.
6. Too Much Caffeine
Coffee and other caffeinated drinks can temporarily improve alertness, but relying heavily on caffeine can become counterproductive.
Large amounts of caffeine, particularly later in the day, may:
- Interfere with sleep
- Delay falling asleep
- Reduce sleep quality
- Increase anxiety or restlessness
- Create a cycle of daytime tiredness and further caffeine use
Energy drinks may contain particularly high levels of caffeine alongside significant amounts of sugar.
Reducing caffeine gradually and avoiding it later in the day may help if sleep is being disrupted.
7. Alcohol and Poor Sleep
Some people use alcohol to help them relax in the evening.
Although alcohol can make you feel sleepy initially, it can interfere with normal sleep patterns and contribute to poorer-quality sleep.
As a result, you may spend enough hours in bed but still wake feeling unrefreshed.
Regular or excessive alcohol consumption may also affect many other aspects of physical and mental health and should be discussed honestly during a medical assessment.
Medical Causes of Persistent Fatigue
Lifestyle changes can help when tiredness is caused by everyday habits, but persistent fatigue sometimes has an underlying medical explanation.
1. Iron Deficiency Anaemia
Iron deficiency anaemia is an important and common cause of fatigue.
Red blood cells contain haemoglobin, which helps transport oxygen around the body. When iron levels are insufficient, haemoglobin production can fall.
Symptoms may include:
- Fatigue
- Lack of energy
- Shortness of breath
- Palpitations
- Headaches
- Pale skin
Some people are at greater risk of iron deficiency, including those experiencing heavy menstrual bleeding, certain gastrointestinal conditions or diets with inadequate iron.
A Full Blood Count and iron studies can help investigate whether anaemia or iron deficiency is contributing to your symptoms.
Do not start taking high-dose iron supplements simply because you feel tired. It is preferable to establish whether you are actually deficient and investigate why.
2. Vitamin B12 or Folate Deficiency
Vitamin B12 and folate are important for normal red blood cell production and other bodily functions.
Deficiencies can sometimes contribute to symptoms such as:
- Fatigue
- Weakness
- Reduced concentration
- Mouth or tongue problems
- Neurological symptoms in some cases
A blood test can assess vitamin B12 and folate levels when clinically appropriate.
3. Thyroid Problems
Your thyroid gland produces hormones that help regulate many bodily functions, including metabolism.
An underactive thyroid, known as hypothyroidism, can lead to symptoms such as:
- Persistent tiredness
- Feeling cold
- Weight gain
- Difficulty concentrating
- Dry skin
- Constipation
- Low mood
Thyroid disorders can often be investigated through a blood test measuring thyroid function.
It is important not to diagnose thyroid disease based on fatigue alone because many conditions can cause similar symptoms.
4. Diabetes
Persistent fatigue can sometimes be associated with diabetes.
Other symptoms may include:
- Feeling very thirsty
- Urinating more often
- Unexplained weight loss
- Blurred vision
- Recurrent infections
An HbA1c blood test can provide information about your average blood glucose levels over the previous few months and may be used when investigating diabetes.
If you have symptoms that could suggest diabetes, speak to a healthcare professional rather than waiting until your next routine health check.
5. Sleep Apnoea
If you sleep for a reasonable number of hours but still wake feeling exhausted, the quality of your sleep may be the problem.
Obstructive sleep apnoea causes breathing to repeatedly stop and start during sleep.
Possible signs include:
- Loud snoring
- Gasping, choking or snorting during sleep
- Waking frequently
- Morning headaches
- Feeling extremely tired during the day
- Difficulty concentrating
People are often unaware that their breathing is being interrupted until a partner or family member notices it.
Sleep apnoea is worth investigating because it can have consequences beyond daytime tiredness.
6. Anxiety and Depression
Fatigue does not always have a purely physical explanation.
Anxiety, depression and prolonged psychological stress can all have significant effects on energy levels.
Depression may be associated with:
- Low mood
- Reduced motivation
- Loss of enjoyment
- Sleep changes
- Appetite changes
- Poor concentration
- Feeling physically slowed down or exhausted
Anxiety can also contribute to fatigue, especially if constant worry or physical tension is affecting sleep.
Physical and psychological causes can also occur together.
For this reason, a thorough assessment should consider the whole person rather than viewing fatigue purely as a blood-test problem.
7. Medication Side Effects
Some medicines can make people feel tired or drowsy.
Examples can include certain:
- Antihistamines
- Pain medicines
- Antidepressants
- Anxiety medicines
- Blood pressure treatments
- Sleeping medicines
Do not stop prescribed medication because you think it may be causing fatigue without first discussing it with your doctor or pharmacist.
Your medication may need reviewing, but stopping some medicines suddenly can cause problems.
8. Recent Infection or Illness
It is common to feel tired while recovering from an infection.
For some people, fatigue may continue for a period after the main symptoms of an illness have resolved.
The pattern, severity and duration of post-infection fatigue can vary considerably.
If you are not recovering as expected or develop new symptoms, speak to a doctor.
9. Other Medical Conditions
Persistent fatigue can occur alongside many different health conditions.
These can include problems affecting the:
- Heart
- Lungs
- Kidneys
- Liver
- Immune system
- Hormone system
- Blood
This does not mean that persistent fatigue usually indicates serious illness.
It means that ongoing unexplained fatigue deserves appropriate assessment, particularly when other symptoms are present.
When Should You See a Doctor About Fatigue?
Occasional tiredness after a demanding few days usually does not require medical investigation.
However, the NHS advises speaking to a GP if you have been feeling tired for a few weeks and do not know why, if fatigue is affecting your daily life or if it occurs alongside other symptoms.
Consider arranging an appointment if:
- You have been unusually tired for several weeks
- Rest and improved sleep are not helping
- Your tiredness is getting progressively worse
- Fatigue is affecting your work or family responsibilities
- You struggle to concentrate or perform normal daily tasks
- You regularly wake exhausted despite having slept
- You feel unusually breathless
- You experience heart palpitations
- Your weight has changed unexpectedly
- Your appetite has changed
- You have persistent low mood
- Your memory or concentration has noticeably changed
- You experience excessive thirst or frequent urination
- Somebody has noticed loud snoring, gasping or choking while you sleep
You do not need to wait until fatigue becomes severe before seeking medical advice.
When Fatigue Needs Urgent Medical Attention
Most causes of tiredness are not medical emergencies.
However, call 999 or seek emergency medical care if fatigue occurs alongside symptoms that could indicate a serious acute condition, including:
- Chest pain or severe chest pressure
- Severe difficulty breathing
- Sudden weakness or numbness, particularly affecting one side of the body
- Sudden difficulty speaking
- Sudden severe confusion
- Loss of consciousness
- Severe or rapidly worsening symptoms that make you feel seriously unwell
Other symptoms such as significant unexplained bleeding, a very high temperature with severe illness or persistent severe pain may also require urgent medical assessment depending on the circumstances.
In the UK, call 999 for a life-threatening emergency. For urgent symptoms that are not immediately life-threatening, NHS 111 can advise you on the appropriate service.
What Happens During a Health Check for Fatigue?
There is no single “fatigue test”.
A good assessment starts with understanding your symptoms.
During a Private GP consultation, your doctor may ask about:
- How long you have been tired
- Whether fatigue is constant or intermittent
- Your sleeping pattern
- Snoring or disrupted sleep
- Diet
- Alcohol consumption
- Caffeine
- Exercise
- Stress
- Mood
- Medication
- Menstrual bleeding
- Weight changes
- Recent infections
- Family medical history
- Other physical symptoms
Your GP may also perform an examination and recommend specific investigations depending on your history.
Which Blood Tests Can Help Investigate Fatigue?
Blood tests can be useful when persistent fatigue may have a medical cause.
There is no need for every patient to undergo every available test. Investigations should be selected according to symptoms, medical history and clinical judgement.
At Niva Medical Clinic, a comprehensive private health check can include blood tests such as:
Full Blood Count
A Full Blood Count can help investigate conditions including anaemia and certain blood abnormalities.
Iron Studies
Iron testing can help identify iron deficiency, including cases where reduced iron stores may be contributing to symptoms.
Thyroid Function Tests
These tests help assess whether abnormal thyroid hormone levels could be contributing to fatigue, weight changes, mood symptoms or other problems.
HbA1c
HbA1c provides information about average blood glucose and can be used when investigating or monitoring diabetes.
Vitamin B12 and Folate
These nutrients are important for normal blood and neurological function.
Deficiencies may sometimes contribute to fatigue and other symptoms.
Kidney and Liver Function
Kidney and liver blood tests provide information about organ function and may form part of a broader health assessment.
Vitamin D
Vitamin D testing may be considered in appropriate circumstances. At Niva Medical Clinic, Vitamin D is available as an additional test within its published health-check options.
The most useful tests depend on your individual symptoms and risk factors.
Private Health Checks at Niva Medical Clinic in Stanmore
If you have been feeling tired all the time and cannot identify why, a health check can help provide a structured overview of your health.
Niva Medical Clinic provides Private GP-led health checks in Stanmore, with access to physical examinations, blood testing and diagnostic investigations.
Niva’s published comprehensive health check includes assessment of:
- Blood pressure
- Pulse
- Oxygen saturation
- BMI
- Cardiovascular health
- Respiratory health
- Abdominal health
- Urinalysis
Its published comprehensive blood-testing panel also includes:
- Full Blood Count
- Kidney function
- Liver function
- Thyroid function
- HbA1c
- Cholesterol and lipids
- Iron studies
- Vitamin B12
- Folate
- Bone profile
- Uric acid
Additional investigations can be recommended depending on your medical circumstances.
This means a health check can look beyond tiredness as an isolated symptom and assess several aspects of your overall health.
Why Choose a GP-Led Assessment Rather Than Ordering Random Blood Tests?
With private blood testing increasingly accessible, it can be tempting to order a long list of tests online whenever you feel unwell.
That is not always the best approach.
A test result only makes sense within the context of your:
- Symptoms
- Medical history
- Medication
- Age
- Risk factors
- Physical examination
- Other test results
Minor abnormalities can sometimes be clinically unimportant, while a “normal” result does not necessarily explain persistent symptoms.
A GP-led assessment helps determine:
- Which tests are actually appropriate.
- What the results mean in your particular situation.
- Whether further investigation is required.
- Whether treatment or lifestyle changes are indicated.
- Whether specialist referral is necessary.
The goal should not simply be to generate laboratory numbers. It should be to understand why you are feeling tired and what to do next.
What Can You Do About Everyday Fatigue?
While you are considering whether medical assessment is needed, it can help to review some basic lifestyle factors.
Prioritise Sleep
Try to maintain relatively consistent sleeping and waking times.
Create a calm sleeping environment and reduce stimulating activities before bed.
The NHS advises adults to aim for approximately six to nine hours of sleep, although individual requirements vary.
Review Your Caffeine Intake
Consider how much coffee, tea, cola or energy drinks you consume and at what time of day.
If sleep is poor, reducing afternoon and evening caffeine may help.
Eat Regularly
Try to maintain a balanced diet with regular meals rather than relying on snacks, sugar or caffeine for quick energy.
Stay Hydrated
Drink fluids regularly throughout the day.
Move Regularly
Appropriate regular physical activity can support energy, cardiovascular health and sleep.
If fatigue is severe or exercise causes concerning symptoms, seek medical advice first.
Manage Stress
Ask yourself whether your exhaustion could partly reflect an unsustainable workload or prolonged emotional pressure.
Rest does not only mean sleep. Reducing psychological demands can also be important.
Do Not Assume Fatigue Is “Just Your Age”
One common mistake is accepting persistent tiredness as an unavoidable consequence of getting older.
Energy levels can certainly change with age and lifestyle, but significant or unexplained fatigue should not automatically be dismissed.
Similarly, people sometimes put tiredness down to:
- Being busy
- Parenting
- Menopause
- Work
- Getting older
- Lack of fitness
Any of these factors may contribute, but they do not rule out another underlying cause.
If your energy levels have clearly changed, particularly without an obvious explanation, discussing the change with a GP is reasonable.
Should You Take Vitamins When You Feel Tired?
Not automatically.
It is easy to assume that fatigue means you are deficient in a vitamin or mineral.
Sometimes that is true.
However, taking supplements without knowing whether you are deficient can be unnecessary, and excessive amounts of certain nutrients can be harmful.
If symptoms or your medical history suggest a deficiency, appropriate blood testing can help establish whether supplementation is actually needed.
Feeling Tired Every Morning Despite Sleeping?
This deserves particular attention.
If you consistently get what appears to be enough sleep but wake feeling exhausted, possible explanations can include:
- Poor sleep quality
- Repeated waking
- Sleep apnoea
- Stress
- Depression
- Alcohol
- Medication
- Pain
- Other underlying medical problems
If somebody tells you that you snore loudly, stop breathing, choke or gasp during sleep, tell your doctor.
Why Early Assessment Can Be Useful
Fatigue is easy to ignore because it often develops gradually.
People adapt.
They drink more coffee, cancel activities, sleep longer at weekends and assume they simply need a holiday.
If an underlying health issue is contributing, however, identifying it can allow appropriate treatment to begin.
Even when tests do not identify a specific medical condition, a GP consultation can help rule out important possibilities and provide clearer guidance about sleep, stress, nutrition, exercise or mental wellbeing.
Book a Private Health Check in Stanmore
If you are feeling tired all the time, struggling with low energy or simply do not feel like yourself, you do not have to guess what is causing it.
A Private GP consultation at Niva Medical Clinic in Stanmore can help assess your symptoms, review your wider health and determine whether blood tests or further investigations are appropriate.
Niva Medical Clinic offers:
- Private GP consultations
- Comprehensive health checks
- Blood testing
- Diagnostic investigations
- Specialist referrals where required
- Face-to-face and remote GP appointments
Book Your Appointment
Niva Medical Clinic
12 Buckingham Parade
The Broadway
Stanmore
HA7 4EB
Call: 020 8865 1938
Book a Private GP consultation or health check to discuss persistent fatigue and understand the appropriate next steps for your health.
Frequently Asked Questions About Fatigue
Why am I feeling tired all the time?
Persistent tiredness can have many possible causes. Common factors include insufficient sleep, stress, poor diet, dehydration, inactivity and excessive caffeine or alcohol. Medical causes can include anaemia, thyroid problems, diabetes, sleep disorders, vitamin deficiencies, medication side effects and mental health conditions.
A medical assessment may be appropriate if there is no obvious explanation.
When should I worry about fatigue?
Speak to a GP if you have been unusually tired for a few weeks and do not know why, if your fatigue is affecting your daily activities or if it occurs with other symptoms such as unexplained weight change, mood changes, shortness of breath or abnormal sleep symptoms.
What blood tests should I have if I am always tired?
There is no universal fatigue blood-test panel.
Depending on your symptoms, a GP may consider tests such as a Full Blood Count, iron studies, thyroid function, HbA1c, vitamin B12, folate, kidney function or liver function.
Your doctor should determine which investigations are clinically appropriate.
Can low iron make you tired?
Yes. Iron deficiency can contribute to fatigue, and iron deficiency anaemia may also cause symptoms such as shortness of breath, palpitations and pale skin.
A blood test can help determine whether iron deficiency or anaemia is present.
Can vitamin B12 deficiency cause fatigue?
Yes. Vitamin B12 deficiency can contribute to tiredness and may also cause other symptoms. Blood testing can help assess B12 levels if deficiency is suspected.
Can thyroid problems make you feel tired?
Yes. Thyroid disorders can affect energy levels.
An underactive thyroid may be associated with tiredness, weight gain, feeling cold and difficulty concentrating, although symptoms vary considerably between patients.
Can diabetes cause tiredness?
Fatigue can occur with diabetes. Other symptoms can include increased thirst, frequent urination and unexplained weight loss.
If diabetes is suspected, a doctor may recommend blood glucose testing, including HbA1c.
Why do I feel tired even after eight hours of sleep?
The amount of sleep is only part of the picture.
Poor sleep quality, sleep apnoea, alcohol, stress, anxiety, depression, medication or an underlying physical condition can leave you feeling unrefreshed despite spending enough time in bed.
Can stress cause extreme tiredness?
Yes. Prolonged stress can interfere with sleep, concentration and emotional wellbeing and can contribute significantly to fatigue.
However, persistent tiredness should not automatically be assumed to be caused by stress without considering other possibilities.
Should I take iron or vitamin supplements for tiredness?
Not unless there is a good reason to do so.
Where possible, it is better to identify whether a deficiency actually exists and establish its cause before taking high-dose supplements.
Can a health check find the cause of fatigue?
A health check can help identify or rule out several potential contributors to fatigue.
The assessment may include discussing your symptoms, reviewing your medical history, carrying out a physical examination and arranging blood tests or other investigations.
Not every case of fatigue has a single identifiable cause, but a structured medical assessment can help determine the most appropriate next step.
Where can I get a private health check for fatigue in Stanmore?
Niva Medical Clinic offers Private GP consultations, comprehensive health checks and blood testing at 12 Buckingham Parade, The Broadway, Stanmore, HA7 4EB.
Call 020 8865 1938 to enquire about an appointment.
Is severe fatigue an emergency?
Fatigue alone is not usually an emergency.
However, call 999 if severe tiredness occurs with potentially life-threatening symptoms such as chest pain, severe breathing difficulty, loss of consciousness or sudden symptoms suggestive of a stroke, including weakness, confusion or difficulty speaking.
