---
title: "Tiredness & low energy: symptoms, causes & treatment"
description: "Persistent tiredness is one of the most common reasons people see a GP."
url: "https://www.sanarahealth.co.uk/conditions/low-energy-fatigue/"
source: "Sanara Health"
licence: "Quote with attribution and a link to the url above."
---
# Tiredness & low energy: symptoms, causes & treatment

Persistent tiredness is one of the most common reasons people see a GP. Often it’s lifestyle and recoverable; sometimes it’s a sign of something checkable — low iron, thyroid issues, low vitamin D, sleep apnoea or low mood.

Editorial information by **Kaiser Khan**. Not clinically reviewed.

## Symptoms

- Tiredness not relieved by rest
- Difficulty concentrating ("brain fog")
- Needing caffeine to function
- Low motivation or mood alongside fatigue

## Why it happens

Sleep debt and poor sleep quality top the list, followed by stress, low mood, iron deficiency (especially in menstruating women), thyroid problems, vitamin D or B12 deficiency, alcohol, and sleep apnoea — especially with snoring and daytime sleepiness.

## Treatment

A GP consultation can take a proper history and arrange targeted blood tests rather than guesswork. Treating an identified cause — iron, thyroid, sleep apnoea, mood — usually transforms energy.

## Self-care that helps

Protect a consistent 7–9 hour sleep window; morning daylight; regular movement; limit alcohol and late caffeine; consider vitamin D in autumn/winter as per UK guidance.

## When to get help

Fatigue with weight loss, night sweats, breathlessness, chest pain, or that persists beyond a few weeks despite good sleep deserves assessment — don’t just push through.

[See our tiredness & low energy support →](https://www.sanarahealth.co.uk/compare/)

Go deeper

## Related guides

[Seeing a doctor online in the UK: what to expect and how to spot a safe service — What online GP consultations can and can't do, what the 2025 rule changes mean, and the red flags that separate safe providers from risky ones.](https://www.sanarahealth.co.uk/guides/online-doctor-uk-what-to-expect/)

[Vitamin D in the UK: why most of us need to think about it — UK sunlight can't supply vitamin D for half the year. A plain-English UK guide to who needs a supplement, how much, and what it does.](https://www.sanarahealth.co.uk/guides/vitamin-d-uk-guide/)

Available without prescription

## Products that can help

[Everyday health — Vitamin D3: 1000 IU explained](https://www.sanarahealth.co.uk/supplements/vitamin-d3-1000iu/)

[Everyday health — Omega-3 fish oil](https://www.sanarahealth.co.uk/supplements/omega-3-fish-oil/)

[Everyday health — Daily multivitamins](https://www.sanarahealth.co.uk/supplements/daily-multivitamin/)