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Body Aches and Fatigue: Common Causes and When to Dig Deeper

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Body aches and fatigue most often come from a short-term cause: a viral infection such as the flu or COVID-19, a hard stretch of physical effort, poor sleep or stress. When the two symptoms last for weeks or keep coming back, the list widens to include anemia, sleep apnea, thyroid and autoimmune conditions, depression and anxiety, and fibromyalgia. This guide walks through each group, explains how clinicians sort them out, and shows what to do while you wait for answers.

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TL;DR

  • Whole-body muscle pain is most often caused by an infection such as the flu, and it usually fades as the illness does.
  • Aches and tiredness that last more than a few weeks deserve a medical visit, because causes range from poor sleep and stress to anemia, autoimmune disease and fibromyalgia.
  • Doctors consider fibromyalgia when diffuse pain, fatigue and sleep problems have lasted at least three months.
  • Chest pain, shortness of breath, a fast or irregular heartbeat, fainting or a severe headache with fatigue call for emergency care.
  • If fibromyalgia is on your list, the FM1® Test is a blood test built to look for it, and we cover it below.

Table of Contents

Why aches and fatigue so often arrive together

Pain and tiredness feed each other. Pain disrupts sleep, poor sleep lowers your pain threshold, and a body fighting inflammation sends out signals that make muscles ache and energy drop. One review of the link between chronic pain and chronic fatigue is beyond what a single page can settle, but clinical guidance is consistent on one point: fatigue is a common, non-specific symptom. NICE guidance for clinicians describes it as having no universal definition, being experienced subjectively, and pointing to physical causes, medications, psychosocial factors or a combination.

That is why the same two symptoms can mean a cold this week and something longer-term next month. The useful question is not just what is causing this, but how long it has lasted and what else comes with it.

Infections: the most common explanation

If your muscles ache all over, think infection first. Mayo Clinic notes that pain felt throughout the whole body is most often caused by an infection such as the flu. Colds and other viral or bacterial infections can also leave muscles achy and stiff by triggering immune and inflammatory responses.

Fever makes it worse. As UCLA Health explains, a higher body temperature causes shivering, and muscles tense up and begin to hurt.

COVID-19 and aches without a fever

COVID-19 can cause muscle aches and tiredness. According to Mayo Clinic’s news network, these symptoms are usually more common with COVID-19 than with a common cold, although fever is usually part of the picture.

Aches without a fever are still possible. Mayo Clinic lists COVID-19 among the causes of fatigue, and aches and tiredness can appear before a fever does, or without one. Some infections, including Lyme disease, can also cause fatigue and aches without an obvious fever early on. UCLA Health advises seeing a clinician sooner if aches follow a tick bite, come with a rash, or involve severe redness or swelling.

Everyday causes: sleep, stress, effort and lifestyle

Not every ache needs a diagnosis. Mild fatigue can come from overwork, poor sleep, worry, boredom or lack of exercise. The usual suspects:

  • Overuse or injury. A new workout, a long day of lifting or a repeated strain can leave muscles sore for a day or two. MedlinePlus lists tension or stress, overuse and injury among the common causes of muscle aches.
  • Poor sleep. Mayo Clinic includes poor sleep and lack of exercise among the lifestyle causes of fatigue.
  • Stress and muscle tension. Chronic stress keeps muscles braced, especially in the neck, shoulders and back, and wears down energy at the same time.
  • Medications and substances. Clinicians are advised to review medications and substance use when evaluating fatigue, so bring a full list to your visit.

If the pattern fits one of these and improves with rest, a few days of self-care may be all you need. If it does not improve, the next group matters.

When aches and fatigue keep coming back

Persistent or recurring symptoms are the question many readers are really asking. No single page covers every cause, but major clinical sources agree on the main groups.

Blood and metabolic conditions. NICE lists anemia, diabetes and, less commonly, malignancy among the physical causes of tiredness. Mayo Clinic adds sleep apnea to its list of conditions linked with fatigue.

Mood and sleep disorders. Anxiety and depression are well-recognized causes of fatigue and can also bring on physical aches. Sleep apnea and other sleep disorders can leave you exhausted no matter how long you are in bed.

Autoimmune and inflammatory conditions. MedlinePlus names lupus, polymyalgia rheumatica and polymyositis among the possible causes of muscle aches and pain. Mayo Clinic mentions chronic infection or inflammation as a fatigue cause.

Muscle breakdown. MedlinePlus also lists rhabdomyolysis, a serious condition that needs urgent medical attention.

Fibromyalgia. Both MedlinePlus and Mayo Clinic list fibromyalgia as a cause, and it deserves its own section because it so closely matches the pattern of widespread pain plus exhaustion.

Five groups of causes for recurring aches

Could it be fibromyalgia?

Fibromyalgia is a chronic, centralized pain condition in which the body processes painful signals differently. According to the American Academy of Family Physicians, it commonly includes diffuse chronic pain, poor sleep, fatigue, cognitive problems and mood changes. MedlinePlus describes it alongside tenderness, sleep difficulties, fatigue and headaches.

Clinicians consider the diagnosis when diffuse pain, fatigue and sleep disturbance have lasted at least three months. Established criteria from the American College of Rheumatology or the AAPT can be used, and the same guidance notes that reaching a diagnosis and educating the patient can bring reassurance and cut down on unnecessary testing.

The causes are still being studied. Public health summaries list risk factors or triggers such as stressful or traumatic events, accidents, injuries and repeated injuries rather than one proven cause.

If your pain is widespread, your sleep is unrefreshing, your thinking feels foggy and the symptoms have lasted months, bring up fibromyalgia with your doctor. Say it in plain words: “I have had body aches and fatigue for X months. Could this be fibromyalgia?”

Could it be fibromyalgia?

How clinicians work out the cause

Evaluation starts with a conversation and an exam, not a battery of tests. Guidance from a primary care review of fatigue lists what a clinician explores: onset, duration and severity, associated symptoms, medications and substances, sleep, social history and red flags. Physical findings such as pallor, swollen lymph nodes, a goiter, heart murmurs or swelling raise suspicion for specific causes.

The American Academy of Family Physicians says that broad laboratory testing without specific indications is not high-yield and changes treatment in only about 5% of patients, so tests should follow what the history and exam suggest. It also recommends validated screening tools for sleep, mood and substance use problems, and a medication review.

What does that mean for you? Come prepared. Write down:

  1. When the aches and tiredness started and whether they come and go.
  2. Where it hurts, and whether it moves around.
  3. How you sleep and how you feel on waking.
  4. Every medication and supplement you take.
  5. Other symptoms: fever, rash, headaches, brain fog, mood changes, digestive trouble.

The more specific your notes, the more precisely your clinician can choose which test to order, whether that is a routine blood panel, a sleep study or a targeted test for a condition like fibromyalgia.

Our perspective on aches, fatigue and fibromyalgia

Many people with widespread pain and exhaustion spend years being told that their results look normal. Routine blood work is designed to find things like anemia or thyroid problems, and it was never built to look for fibromyalgia.

That gap is why we built the FM1® Test. It is a blood test that uses DNA science to identify immune system changes related to fibromyalgia, chronic pain and fatigue. Our position is that the test looks for specific DNA genomic signatures in positive patients, which we believe supports the case that fibromyalgia is a legitimate medical condition.

For patients, that can mean having objective evidence in hand when talking with doctors, family and employers. For healthcare providers, it can mean a more reliable diagnostic tool to add to the clinical picture. The test needs only a quick blood draw, results are available within about a week, and patients who test positive are offered access to a no-cost clinical trial.

If your symptoms have lasted months and the usual explanations have not fit, a targeted test is a logical next step to discuss with your clinician.

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Take the next step with the FM1® Test

If your aches and fatigue have lasted for months and fibromyalgia is a possibility, the FM1® Test gives you a concrete way to investigate. It is a blood test that looks for DNA-based immune system changes related to fibromyalgia. It requires a simple blood draw at a local facility, and results are available within about a week. According to the company, the test is covered by Medicare and insurance, and positive patients can join a clinical trial at no cost.

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To learn how the test works and how to get started, visit the FM1® Test page. Your doctor can also help you decide whether it fits your situation.

What helps while you wait for answers

Self-care will not replace a diagnosis, but it can make days easier. UCLA Health suggests these for body aches while a virus runs its course or you wait for treatment:

  • Stay hydrated. Fluids help, particularly with a fever.
  • Use heat. A warm bath, heating pad or warm shower can relax tight muscles.
  • Regulate your temperature. Dress in layers so shivering does not tense muscles further.
  • Rest. Let your body recover, and protect your sleep.
  • Consider over-the-counter pain relief. NSAIDs may ease aches. Check the label, and ask a pharmacist or doctor first if you have kidney disease, stomach ulcers, heart disease or take blood thinners.

If you have no fever or other symptoms but the aches occur often or persist, UCLA Health recommends seeing a clinician when they have not improved after 3 to 5 days.

Red flags that need urgent care

Mayo Clinic advises seeking emergency help if fatigue occurs together with chest pain, shortness of breath, an irregular or fast heartbeat, feeling faint, severe stomach, pelvic or back pain, unusual bleeding or a severe headache. Call 911 or go to the nearest emergency room if any of these appear.

Book a prompt appointment, rather than waiting, if aches follow a tick bite, come with a rash, or are accompanied by severe redness or swelling.

FAQ

Why do I have body aches and fatigue but no fever?

Infections do not always trigger a noticeable fever, and Lyme disease, urinary tract infections and some respiratory infections can cause aches and tiredness without one. Poor sleep, stress, overuse, anemia, thyroid problems and fibromyalgia are other possibilities. If it lasts more than 3 to 5 days without improving, see a clinician.

Can COVID-19 cause body aches and fatigue?

Yes. Muscle aches and tiredness can occur with COVID-19 and are usually more common than with a cold. Fever is typically part of the illness but not in every case, so a test is the way to tell the difference from the flu or a cold.

How long should body aches and fatigue last before I see a doctor?

Aches from a virus or a hard workout usually settle within days. If symptoms have not improved after 3 to 5 days, or you notice a rash, a tick bite or severe swelling, make an appointment. Pain, fatigue and poor sleep that last three months or more are the point at which clinicians consider fibromyalgia.

Could my body aches and fatigue be fibromyalgia?

Possibly. Fibromyalgia typically involves widespread pain, fatigue, unrefreshing sleep and sometimes brain fog lasting at least three months. Your doctor can assess you using established criteria, and the FM1® Test is a blood test designed to identify DNA-based immune changes related to fibromyalgia.

What blood tests check for the cause of fatigue and aches?

There is no single test for every cause. Clinicians choose tests based on your history and exam, such as a blood count for anemia, glucose for diabetes or thyroid tests. For suspected fibromyalgia, the FM1® Test is a targeted option to discuss with your doctor.

Sources

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