Short answer: feeling tired all day has everyday causes, including poor sleep, stress, an unhealthy lifestyle and hormonal changes, but constant tiredness can also be linked to medical conditions, so don't self-diagnose.[6]
Feeling tired all day: what to know
- Sleep: aim for 6 to 9 hours, keep consistent sleep times, and relax for a couple of hours before bed.[6]
- Lifestyle: eat well and exercise regularly; avoid smoking, heavy drinking, and caffeine, food or exercise in the hours before sleep, and keep screens away for the hour before bed.[6]
- Medical causes the NHS lists include sleep apnoea, iron deficiency anaemia, diabetes, an overactive thyroid and ME/CFS, each with its own warning symptoms.[6]
When to see a doctor
See a GP if you've been tired for a few weeks and don't know why, it's affecting daily life, you're also losing weight or your mood has changed, or you've been told you make gasping, snorting or choking noises while asleep.[6] A GP may order blood tests.[6]
Sources
Written by the Prife iTeraCare team and last reviewed on 10 October 2026. This is general information, not medical advice, and it does not replace your doctor or physiotherapist. A session is a wellness experience, not a medical treatment.
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