Everyone feels tired from time to time. A poor night’s sleep, a busy week, stress, travel, or a short illness can leave you feeling flat. Usually, this improves with rest and simple self-care.

Fatigue is different when it keeps going, feels unusual for you, or begins to interfere with work, family life, study, exercise, or daily tasks. In that situation, it is worth speaking with a GP rather than assuming it is just a lifestyle issue.

What Is Fatigue?

Fatigue is a feeling of ongoing physical or mental exhaustion. It may feel like low energy, heaviness, weakness, poor motivation, sleepiness, or becoming tired quickly after starting an activity.

It can come on gradually or appear more suddenly. Because fatigue is a symptom rather than a diagnosis, the aim is to understand what may be driving it.

Is It Normal to Feel Tired All the Time?

Feeling tired occasionally is common. Feeling tired all the time is different, especially if it does not improve with sleep or rest.

If fatigue continues for more than a couple of weeks, is getting worse, or comes with other symptoms, a GP review can help check whether there is an underlying cause.

Here are some Common Causes of Fatigue

Fatigue can have more than one cause. Sometimes lifestyle factors and health conditions overlap, which is why a broad assessment can be helpful.

  • Poor Sleep Quality: You may be sleeping enough hours but still not getting restorative sleep. Pain, stress, alcohol, caffeine, screen use, shift work, restless legs, or frequent waking can all affect sleep quality.
  • Iron Deficiency: Low iron can make everyday activities feel harder. It may also cause dizziness, shortness of breath, headaches, poor concentration, or reduced exercise tolerance.
  • Thyroid Conditions: An underactive thyroid can slow the body down and contribute to fatigue, weight changes, dry skin, constipation, low mood, or feeling cold.
  • Stress and Anxiety: Stress and anxiety can keep the body switched on, even when you are trying to rest. Over time, this can affect sleep, energy, concentration, and appetite.
  • Vitamin Deficiencies: Low vitamin B12, folate, or vitamin D may contribute to tiredness in some people. Testing can help determine whether a deficiency is present.
  • Diabetes: Diabetes can cause tiredness, especially when blood sugar levels are high or fluctuating. Other signs may include increased thirst, frequent urination, blurred vision, or unexplained weight changes.
  • Sleep Apnoea: Sleep apnoea can cause repeated pauses in breathing during sleep. People may snore, wake unrefreshed, feel sleepy during the day, or have morning headaches.
  • Dehydration: Even mild dehydration can affect energy, concentration, and physical performance. This may be more noticeable during hot weather, illness, exercise, or busy workdays.
  • Medication Side Effects: Some medicines can cause drowsiness or fatigue. This may include certain antihistamines, pain medicines, antidepressants, blood pressure medicines, or sedatives. Do not stop prescribed medicine without medical advice.
  • Chronic Health Conditions: Ongoing fatigue may occur with infections, inflammatory conditions, heart or kidney disease, liver problems, autoimmune conditions, long COVID, cancer, and other medical concerns.

When Is Fatigue a Sign of an Underlying Health Condition?

Fatigue is more concerning when it is persistent, unexplained, worsening, or stopping you from doing normal tasks. It also needs review if it comes with weight loss, fever, night sweats, chest pain, breathlessness, palpitations, dizziness, mood changes, bowel changes, or new pain.

In these cases, the goal is not to assume the worst. The goal is to check properly and avoid missing something that needs care.

What Tests Might a GP Recommend?

A GP may ask about sleep, diet, exercise, stress, mental health, periods, medications, alcohol, recent infections, and other symptoms. They may also examine you and recommend tests.

Common tests may include a full blood count, iron studies, thyroid function, B12, folate, vitamin D, kidney and liver function, blood glucose or HbA1c, inflammatory markers, urine testing, or other tests based on your symptoms.

How Is Fatigue Managed and What You Can Do

Management depends on the cause. If poor sleep is the main issue, sleep routine and lifestyle changes may help. If low iron, thyroid disease, diabetes, vitamin deficiency, medication side effects, or sleep apnoea is found, the plan will be different.

Self-care may still support recovery. This can include regular meals, hydration, gentle physical activity, sleep routine, reducing excess alcohol, managing stress, and pacing activity while symptoms are being investigated.

When Should You See a GP If You Feel Fatigued?

See a GP if fatigue lasts more than two weeks and is not improving, or sooner if it is worrying you, stopping you from functioning, or appearing with other symptoms.

Seek urgent medical care if fatigue is linked with chest pain, severe shortness of breath, fainting, confusion, sudden weakness, severe headache, or symptoms of stroke.

FAQs Patients Ask When They Feel Fatigued

 

Why am I tired even after getting enough sleep?

Sleep quality may be poor, or another issue such as iron deficiency, thyroid disease, stress, sleep apnoea, medication effects, or another health condition may be involved.

Can stress cause fatigue?

Yes. Stress can affect sleep, appetite, concentration, hormones, and energy levels. Persistent stress-related fatigue is still worth discussing with a GP.

Can low iron make you feel tired?

Yes. Low iron can contribute to tiredness, weakness, dizziness, breathlessness, and poor concentration. Blood tests are needed to confirm it.

What vitamin deficiencies can cause fatigue?

Low B12, folate, or vitamin D may contribute to fatigue in some people. A GP can advise which tests are suitable.

Can dehydration cause fatigue?

Yes. Dehydration can reduce energy and concentration. However, ongoing fatigue should not be blamed on dehydration without considering other causes.

When should I be concerned about constant tiredness?

Be concerned if it lasts more than two weeks, is getting worse, affects daily life, or appears with symptoms such as weight loss, fever, breathlessness, chest pain, or mood changes.

What tests are used to investigate fatigue?

Tests may include full blood count, iron studies, thyroid function, vitamin levels, glucose testing, kidney and liver function, urine testing, or other investigations.

Can fatigue be a sign of diabetes?

Yes, fatigue can be one symptom of diabetes, particularly when it appears with thirst, frequent urination, blurred vision, or unexplained weight changes.

Final Thoughts

Fatigue is common, but ongoing fatigue should not be ignored when it feels unusual, persistent, or disruptive. A GP can help sort through the possible causes, arrange relevant tests, and guide the next step.

Parkwood Green Medical can assist with a GP appointment if tiredness is affecting your day-to-day life or does not seem to be improving.