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Fatigue and tiredness: causes, warning signs & what to do

Feeling constantly tired is one of the most common health complaints. Often it is lifestyle, but persistent fatigue can signal anaemia, thyroid problems, diabetes or low mood.

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Common causes of fatigue and tiredness

Poor sleep, stress or overwork
Anaemia (low haemoglobin/iron)
Thyroid problems (usually underactive)
Diabetes or blood-sugar swings
Depression or anxiety
Vitamin D or B12 deficiency; viral illness

When to see a doctor urgently

Fatigue with chest pain, severe breathlessness or fainting — seek urgent care
Rapid unexplained weight loss with fatigue
Fatigue with very pale skin, blood loss or a racing heart
Fatigue lasting weeks despite rest

Frequently asked questions

What blood tests check for the cause of fatigue?

Common ones are a full blood count (anaemia), thyroid (TSH), blood sugar/HbA1c, and vitamin D and B12. MedDroid can explain your results in plain language.

When should tiredness be investigated?

If it lasts more than a couple of weeks despite good sleep, or comes with weight loss, breathlessness or low mood, see a doctor for simple tests.

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MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.