What Is Fibromyalgia, and Why Do Scans Look Normal?
Fibromyalgia is a long-term condition. It causes widespread pain, fatigue and heightened sensitivity throughout the body. Scans look normal because the problem is not in the bones, joints or soft tissues themselves. It is a disorder of how the nervous system processes pain. So X-rays, MRI and blood tests typically show no visible damage.
Key points
- Fibromyalgia is real. It involves changes in how the brain and spinal cord process pain signals.
- No scan or blood test can confirm fibromyalgia. It is diagnosed clinically.
- Scans may still be useful to rule out other conditions that cause similar symptoms.
- Treatment usually combines graded activity, sleep support and ways of managing pain.
- If you have sudden weakness, numbness or loss of bladder or bowel control, get urgent medical help.
Perhaps you have pain that moves around your body. Perhaps you feel exhausted, and sleep does not fix it. And your scan results keep coming back "normal." You are not imagining it. Fibromyalgia affects how your nervous system reads pain signals. The result is real, persistent pain, even though there is no structural damage for a scan to find.
This page explains what fibromyalgia is, why scans look normal, when scans might still help, and what you can do next.
What are the main symptoms of fibromyalgia?
The main symptom is widespread pain that lasts three months or more. It is felt on both sides of the body, and above and below the waist. But fibromyalgia rarely stops at pain alone.
Aching, burning or stabbing feelings that can move from one area to another from day to day.
Tiredness that stays even after a full night of sleep. People often call it "bone-deep."
Trouble falling asleep, waking often, or waking unrefreshed even after sleeping for hours.
Often called "fibro fog." This includes trouble concentrating, difficulty finding words and forgetfulness.
Other common problems include headaches, irritable bowel symptoms, and heightened sensitivity to light, sound or temperature. Many people also feel stiff first thing in the morning. The mix of symptoms can vary hugely from person to person.
Why do scans and blood tests come back normal with fibromyalgia?
Because there is nothing structurally wrong. Fibromyalgia is not caused by damaged joints, inflamed tissue or broken bones. It is a disorder of central sensitisation. This means the brain and spinal cord amplify pain signals. Feelings that should be mild turn into something much more intense.
Think of it like a volume dial. In most people, a gentle touch feels gentle. In fibromyalgia, the nervous system turns that dial up, so the same touch may feel painful. X-rays, CT and MRI are made to take pictures of structures like bones, discs and ligaments. So they simply cannot see this change in how signals are processed.
That does not mean scans are useless. They can be very important for ruling out other conditions that look like fibromyalgia, such as inflammatory arthritis, spinal problems or thyroid disorders.
How is fibromyalgia diagnosed?
Fibromyalgia is diagnosed clinically. This means a doctor reaches the diagnosis from your symptoms and your history, and by ruling out other explanations. There is no single test that confirms it.
Your doctor or a rheumatologist will typically:
- Ask about the pattern, length and location of your pain.
- Talk about fatigue, sleep quality and problems with thinking or memory.
- Run blood tests to rule out conditions like rheumatoid arthritis, lupus or an underactive thyroid.
- Possibly order scans to check for joint or spinal problems that could explain your symptoms.
Fibromyalgia is sometimes called a "diagnosis of exclusion." That can be frustrating, because it may mean months of tests before you get a clear answer. But having your pain recognised matters. Knowing that your pain has a recognised medical explanation is an important first step. If you are unsure whether your symptoms need further tests, read more about when to see a specialist.
Can fibromyalgia occur alongside other painful conditions?
Yes, and this is common. Fibromyalgia often occurs together with conditions that do show up on scans, such as osteoarthritis, disc problems, scoliosis or joint hypermobility. When these overlap, it can be hard to know which condition is driving the pain.
This is one case where scans may play a useful supporting role. Not to diagnose fibromyalgia itself, but to find or rule out a structural problem that could be treated separately. For example, say you have fibromyalgia and also have back pain in one area. A scan might show a disc issue or an alignment concern that a physiotherapist or surgeon could address. The fibromyalgia itself would still need a different approach. You can read more about this on our back pain clinic page.
A note on scans. No scan diagnoses fibromyalgia. EOS imaging shows bones, joints and alignment. For soft tissue, discs or nerves, MRI is usually the better tool. If your doctor suspects a structural problem alongside fibromyalgia, they will recommend the most suitable type of scan for you.
What helps with fibromyalgia symptoms?
There is no cure for fibromyalgia. But many people find their symptoms improve a lot with the right mix of strategies. Care is usually guided by your doctor, a rheumatologist or a pain management specialist.
Gentle movement that you increase step by step. Physiotherapy, walking or swimming can reduce pain sensitivity over time.
Better sleep can reduce fatigue and lower pain levels. Regular routines and changes to your sleeping space help.
This may include medicine, cognitive behavioural therapy (CBT), mindfulness or a pain management programme.
In the UK, the NHS, the British Society for Rheumatology and patient groups like Fibromyalgia Action UK all recommend a multidisciplinary approach. This means combining physical activity, psychological support and medicine where suitable, rather than relying on any single treatment.
When should you get urgent help?
Get urgent medical help if you have sudden numbness or weakness in your arms or legs, loss of bladder or bowel control, or severe symptoms with no clear reason that come on quickly. Contact your doctor straight away or go to your nearest emergency department. These symptoms are not typical of fibromyalgia. They need to be checked quickly to rule out other causes.
You may have fibromyalgia along with back, hip or knee pain, and wonder whether a structural problem could be adding to it. If so, you can speak to us about whether a scan would help. We will always be honest if a scan is not the right next step for you.
Before you start treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
Frequently asked questions about fibromyalgia
Yes. Fibromyalgia is recognised by the NHS in the UK, the World Health Organisation and rheumatology bodies worldwide. Research shows measurable changes in how the nervous system processes pain signals, even though these changes do not appear on standard scans.
MRI and X-ray are made to take pictures of structures like bones, discs and soft tissues. Fibromyalgia involves abnormal pain processing in the nervous system, which these scans cannot show. Scans are still useful for ruling out other conditions.
There is no specific blood test for fibromyalgia. Doctors typically check inflammatory markers, thyroid function and autoimmune antibodies. This rules out other conditions that cause similar symptoms.
Yes. Back pain is one of the most common complaints in people with fibromyalgia. It can also occur alongside structural back problems. So it is important to work with a clinician who can tell the two apart.
Fibromyalgia is a long-term condition. Symptoms can go up and down, with flare-ups and calmer periods. Many people find that with the right care, their symptoms become easier to manage over time.
Your own doctor is usually the first person to see. They may refer you to a rheumatologist to confirm it, or to a pain management specialist or physiotherapist for ongoing support.
It can feel that way at first. But graded, gentle exercise is one of the most effective strategies. Starting slowly and building up step by step helps reset the nervous system's pain response over time.
Yes, and the overlap is common. When fibromyalgia occurs with a structural condition, both need to be addressed. Scans can help find the structural part, while fibromyalgia is managed with pain strategies and activity.
There is no cure at present. However, a mix of graded activity, good sleep habits, psychological support and, where suitable, medicine can greatly improve quality of life for many people.
An EOS scan cannot diagnose fibromyalgia. It may help if your doctor suspects a structural or alignment problem that is adding to your symptoms. If you are unsure, ScanAlign offers a free video consultation to talk about whether a scan is right for you.
Not sure if a scan is right for you?
If you have fibromyalgia along with joint or back pain, a short conversation can help you work out the best next step. There is no obligation and no pressure.
Book a free video consultationSources
- NHS. Fibromyalgia. nhs.uk/conditions/fibromyalgia (accessed 2024).
- Clauw DJ. Fibromyalgia: a clinical review. JAMA. 2014;311(15):1547-1555.
- Macfarlane GJ et al. EULAR revised recommendations for the management of fibromyalgia. Annals of the Rheumatic Diseases. 2017;76(2):318-328.
Written by Abbas Dhami (Specialist Diagnostic Radiographer).
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.