Body aches
Diffuse aching in the muscles all over the body, most often part of a viral illness like flu or COVID-19. Usually short-lived and harmless, but persistent widespread aching, or aching with muscle weakness or dark urine, can point to conditions worth investigating.
What it means
Body aches — a generalised, dull aching in the muscles all over — are one of the classic features of a systemic illness, especially a viral infection. When you have flu, COVID-19, glandular fever or many other infections, the body's immune response releases signalling molecules that make the muscles feel sore and heavy; this is usually accompanied by fever, tiredness and other symptoms of the illness, and settles as the infection resolves. Beyond acute infections, widespread body aches have other causes worth knowing. Fibromyalgia causes chronic widespread pain with tenderness, poor sleep and fatigue, without an inflammatory cause on tests. An underactive thyroid can cause aching and stiffness. Certain medications, notably some cholesterol-lowering statins, can cause muscle aches. Vitamin D deficiency is associated with diffuse muscle and bone aching. More rarely, genuine muscle inflammation (myositis) or muscle breakdown causes aching with weakness and, in severe cases, dark urine — which needs urgent attention. And widespread aching with stiffness in the shoulders and hips in an older person can be polymyalgia rheumatica, an inflammatory condition. So while most body aches are simply part of a passing viral illness, persistent, severe or unusual aching deserves a closer look.
Common causes
- Viral infections — flu, COVID-19, glandular fever and many others; the commonest cause, with fever and tiredness.
- Overexertion — unaccustomed exercise or physical strain.
- Fibromyalgia — chronic widespread pain with poor sleep and fatigue, without inflammation on tests.
- Underactive thyroid (hypothyroidism) — aching and stiffness.
- Medications — some statins and others can cause muscle aches.
- Vitamin D deficiency — diffuse muscle and bone aching.
- Muscle inflammation (myositis) or breakdown — aching with weakness, sometimes dark urine; needs urgent care.
- Polymyalgia rheumatica — shoulder and hip aching and stiffness in older adults.
Lab work-up approach
Body aches during an obvious viral illness need no tests and settle on their own. For persistent, unexplained or severe muscle aching, blood tests help sort the causes: creatine kinase (raised in muscle inflammation or breakdown), inflammatory markers (CRP and ESR, raised in polymyalgia rheumatica and other inflammatory conditions), thyroid function, vitamin D, and a review of medications such as statins. If a specific infection is suspected, the relevant tests (for example a viral swab or glandular-fever tests) are used. Mediora.AI can surface a muscle marker (creatine kinase), inflammatory markers and thyroid or vitamin D results and show them together, so a treatable pattern behind persistent body aches is visible; interpreting them belongs with your doctor.
Tests Mediora.AI can interpret
Related conditions
Panels to consider
When to see a doctor
Body aches as part of a short viral illness just need rest, fluids and simple pain relief, and settle within days. See a doctor if body aches are persistent, unexplained, or come with muscle weakness, difficulty rising from a chair or climbing stairs, or if they follow starting a new medication such as a statin. Widespread aching and stiffness in the shoulders and hips in an older person, especially with tiredness, warrants assessment for polymyalgia rheumatica. Seek urgent care for severe muscle pain with weakness and dark (cola-coloured) urine, which can indicate muscle breakdown. Mediora.AI helps flag muscle, inflammatory, thyroid and vitamin D markers that can lie behind persistent body aches; assessing the cause is done by your doctor.