Feeling tired occasionally is normal. Feeling tired most days for several weeks, struggling to complete everyday tasks, or waking up exhausted despite getting enough sleep deserves closer attention.
Persistent tiredness can have many causes, including disrupted sleep, stress, low mood, lifestyle factors, medication, illness and medical conditions. This page can help you understand the possibilities and decide what to do next, but it cannot diagnose the cause.
What does “tired all the time” mean?
People use “tired” to describe different experiences:
- Sleepiness: struggling to stay awake or frequently needing to nap.
- Fatigue: having very little physical or mental energy, even when you do not feel sleepy.
- Reduced stamina: becoming exhausted much sooner than usual.
- Unrefreshing sleep: sleeping for long enough but still waking up tired.
Before deciding what might be causing it, consider:
- How long has the tiredness lasted?
- Did it begin suddenly or gradually?
- Is it present every day or only after certain activities?
- Are you sleeping less, waking repeatedly or working irregular hours?
- Has anyone noticed loud snoring, choking or gasping while you sleep?
- Have you experienced weight changes, breathlessness, pain, low mood or difficulty concentrating?
- Did the tiredness begin after an illness or after starting a new medicine?
Writing these details down can make it easier to explain the problem to a GP.
Common reasons you may feel constantly tired
Not getting restorative sleep
You may spend enough time in bed without getting good-quality sleep. Possible reasons include insomnia, an inconsistent sleep schedule, shift work, noise, pain or regularly using screens late at night.
Loud snoring, choking or gasping during sleep can be signs of sleep apnoea. Speak to a GP if this is happening, particularly if you feel extremely tired during the day.
Stress, anxiety or low mood
Stress can keep the body and mind alert when they should be resting. Anxiety may make it difficult to fall asleep, while depression can affect sleep, motivation, concentration and energy.
Tiredness caused by emotional strain is still real. Talking therapies may help when fatigue is connected to stress, anxiety or low mood.
Caffeine, alcohol and disrupted routines
Caffeine can temporarily make you feel more alert, but consuming it later in the day may interfere with sleep. Its effects can last for several hours.
Alcohol may make you feel sleepy initially but can disturb sleep later in the night. Irregular meals, long periods without eating and major changes to your usual routine may also affect how energetic you feel.
Recovering from illness
Some people experience fatigue during or after an infection. Recovery can take time, even after the other symptoms have improved.
Speak to a GP if the tiredness is severe, worsening or not gradually improving.
Medicines or treatments
Some prescription medicines, over-the-counter products and medical treatments can cause drowsiness or fatigue.
Do not stop prescribed medication without professional advice. A pharmacist or GP can check whether tiredness is a possible side effect and discuss suitable alternatives where appropriate.
A medical condition
Persistent tiredness can sometimes be associated with conditions such as:
- Iron-deficiency anaemia
- Diabetes
- Thyroid problems
- Sleep apnoea
- Certain heart, lung, kidney or liver conditions
- Vitamin deficiencies
- ME/chronic fatigue syndrome
This list is not exhaustive, and having tiredness does not mean you have one of these conditions. A healthcare professional must consider your symptoms, medical history and any appropriate tests.
What can I try?
If you do not have urgent symptoms, some practical changes may help:
- Keep a regular sleep schedule. Try to go to bed and wake up at similar times each day.
- Create a wind-down period. Reduce stimulating activities and bright screens shortly before bed.
- Review your caffeine intake. Consider reducing coffee, tea, energy drinks and other caffeine later in the day.
- Eat regularly. Avoid relying on caffeine or sugary snacks to repeatedly push through exhaustion.
- Introduce activity carefully. Gentle, regular movement may improve energy for some people, but do not force yourself through activity that causes a significant or delayed worsening of symptoms.
- Make space for recovery. Stress management, relaxation and realistic rest periods may help when life has become overwhelming.
- Keep a short fatigue diary. Record sleep, activity, meals, mood, medicines and symptoms for one or two weeks.
A diary may reveal patterns and can provide useful information if you need to see a healthcare professional.
When should I book a GP appointment?
The NHS advises speaking to a GP if:
- You have felt tired for several weeks and do not know why.
- The tiredness is affecting your daily life.
- You also have symptoms such as unexplained weight loss or mood changes.
- Someone has noticed you choking, gasping or snoring loudly while asleep.
- You are concerned about another symptom accompanying the tiredness.
A GP may ask about your sleep, physical health, mental wellbeing, medicines and daily routine. Depending on your symptoms, they may arrange tests for possible causes such as anaemia, diabetes or thyroid problems.
Treatment will depend on the cause. It may involve treating an underlying condition, improving sleep, reviewing medication, accessing talking therapy or being referred for specialist assessment.
When is tiredness an emergency?
Call 999 or go to A&E if tiredness occurs with:
- Severe difficulty breathing
- A chest that feels tight or heavy
- Pain spreading to the arm, back, neck or jaw
- Pale, blue or grey skin, lips or tongue
- Sudden confusion
- Chest pain accompanied by sweating, sickness, light-headedness or shortness of breath
These symptoms need urgent assessment. Do not drive yourself to A&E.
For urgent concerns that do not appear life-threatening, contact NHS 111.
Could it be ME/chronic fatigue syndrome?
ME/chronic fatigue syndrome, or ME/CFS, is a long-term condition that can involve extreme fatigue, unrefreshing sleep, problems with concentration and symptoms becoming worse after physical or mental activity.
These symptoms overlap with many other conditions. There is no single test that confirms ME/CFS, so a GP will usually assess your symptoms and may arrange tests to rule out other explanations.
If ordinary activity causes a pronounced or delayed worsening of your symptoms, mention this specifically to your GP rather than repeatedly trying to push through it.
The bottom line
Being tired does not automatically mean something serious is wrong. However, persistent or unexplained fatigue should not simply be ignored—especially when it affects your work, relationships or ability to manage everyday life.
Start by noticing your sleep and symptom patterns, make manageable changes where appropriate, and arrange a GP appointment if the tiredness continues or concerns you.
This information is educational and is not a diagnosis or a substitute for personalised medical advice.
NHS sources
This content is informational, not medical advice. Always check with a qualified clinician before changing routines that affect your health. Some links may become affiliate links in future.