Does Fibromyalgia Cause Shortness of Breath?

Shortness of breath is strikingly common in fibromyalgia. In one study of 87 women with severe fibromyalgia, 84% reported some degree of breathlessness, and their lung tests showed no cardiac or pulmonary disease to explain it.¹ Although fibromyalgia is best known for widespread pain and fatigue, the condition quietly disrupts breathing through several overlapping mechanisms, from weakened respiratory muscles and stiff chest walls to disordered breathing patterns driven by pain and stress.

How Common Is Breathlessness in Fibromyalgia

Fibromyalgia is not typically listed alongside asthma or COPD when people think of conditions that cause shortness of breath, yet the symptom shows up far more often than most patients or clinicians expect. The study mentioned above used a five-grade breathlessness scale developed by the World Health Organization and found that most participants fell in the milder grades: about 54% reported Grade 1 breathlessness (becoming winded during strenuous activity), while roughly 20% were at Grade 2 (breathless during moderate effort like climbing stairs). A smaller number reported breathlessness at rest or during light activity.¹ Critically, when the researchers ran spirometry and exercise tests, they found no underlying lung disease or heart problem to account for the symptom. This is a pattern that repeats across fibromyalgia research: the breathing complaint is real, but the lungs themselves look structurally fine on standard tests.

A systematic review and meta-analysis that pooled data from multiple case-control studies confirmed the trend. People with fibromyalgia consistently showed reduced breathing muscle strength and reduced voluntary ventilation capacity compared to healthy controls, even though routine lung-function numbers like forced expiratory volume often fell within normal ranges.² In other words, the apparatus that moves air in and out of your lungs is weaker than it should be, but the airways and lung tissue are usually intact.

Weaker Breathing Muscles and a Stiffer Chest Wall

One of the clearest physical findings in fibromyalgia-related breathlessness involves the muscles you use to breathe. Your diaphragm, the intercostal muscles between your ribs, and the accessory muscles in your neck and abdomen all work together to expand and contract the chest. In fibromyalgia, these muscles generate less force than they should. Studies consistently find lower maximal inspiratory pressure (the force you can generate when inhaling as hard as possible) and lower maximal expiratory pressure (the force behind a forceful exhale) in fibromyalgia patients compared to matched healthy individuals.³ One study also found that chest expansion itself was lower in the fibromyalgia group and proposed measuring it as a quick clinical indicator of respiratory muscle weakness.⁴

A Brazilian study comparing women with fibromyalgia to age-matched controls found reduced maximum voluntary ventilation and lower inspiratory pressure in the fibromyalgia group, along with reduced thoracic mobility measured at the chest level. Interestingly, the abdominal measurements told a slightly different story: the fibromyalgia group actually showed higher abdominal expansion, possibly because they were compensating for restricted chest movement by shifting more of the breathing work to the belly.⁵ This kind of compensatory pattern can feel uncomfortable and contribute to the sense that breathing is effortful, even when you are getting enough oxygen.

Why are these muscles weaker? The early research on fibromyalgia and breathing pointed to two culprits: physical deconditioning and something specific to the diaphragm. The 1989 study noted that breathlessness correlated with reduced diaphragmatic strength and with physical inactivity, but not with standard spirometric measurements of lung function.¹ That distinction matters. A person with COPD or asthma has narrowed or damaged airways that show up clearly on a spirometry test. A person with fibromyalgia typically passes spirometry just fine but struggles because the muscles powering the breath are not doing their job fully.

Shallow Breathing and Faster Respiratory Rates

Beyond muscle weakness, the pattern of breathing itself changes in fibromyalgia. A 2025 case-control study found that women with fibromyalgia breathed faster and took shallower breaths than healthy controls, with a significantly higher respiratory rate and a lower volume of air per breath. Their thoracic mobility was also reduced. When the researchers adjusted for perceived stress, some of the differences in overall ventilation disappeared, suggesting that psychological distress plays a role in driving the breathing pattern. But the faster, shallower breathing persisted even after adjusting for stress, indicating something beyond anxiety is at work.⁶

This shallow, rapid breathing pattern is more than a quirk. When you take many small breaths instead of fewer deeper ones, a larger proportion of each breath just fills the airways without reaching the gas-exchanging parts of the lungs. The result is less efficient oxygen delivery per breath. You may feel like you cannot get a satisfying deep breath, a sensation some people describe as “air hunger.” It can be especially unsettling at rest, when there is no obvious reason to feel winded.

Hyperventilation, Anxiety, and the Feedback Loop

Fibromyalgia frequently coexists with anxiety and depression, and both can drive hyperventilation, the rapid overbreathing that flushes too much carbon dioxide out of your blood. A multicenter study that looked specifically at asthma patients found that those who also had fibromyalgia reported worse asthma control, lower quality of life, higher anxiety and depression scores, and more hyperventilation than asthma patients without fibromyalgia, despite having similar asthma severity and using similar medications.⁷ The researchers highlighted that fibromyalgia itself was amplifying the sensation of breathlessness, making the asthma feel worse than it actually was by lung-function standards.

This creates a frustrating feedback loop. Pain and stress prompt faster breathing. Faster breathing leads to a drop in blood carbon dioxide, which triggers tingling, dizziness, chest tightness, and more anxiety. The anxiety then feeds more rapid breathing. If you have fibromyalgia and find that your breathlessness comes with lightheadedness, pins and needles in your fingers, or a feeling of panic, hyperventilation is worth exploring as a contributing factor. It does not mean the symptom is “all in your head,” but rather that the nervous system’s response to chronic pain is disrupting a process that normally runs on autopilot.

Autonomic Dysfunction and the Heart-Lung Connection

Fibromyalgia is increasingly recognized as a condition with significant autonomic nervous system involvement. The autonomic system controls functions you do not consciously direct, including heart rate, blood pressure, and breathing rhythm. Research on heart-rate variability in women with fibromyalgia has found evidence of impaired neurocardiac function, meaning the fine-tuned interplay between heart rate and breathing rhythm is disrupted.⁸

One common manifestation of autonomic dysfunction in fibromyalgia is postural orthostatic tachycardia syndrome (POTS), where your heart rate jumps dramatically when you stand up. This can cause breathlessness on standing or walking that feels disproportionate to the level of activity.⁹ If you notice that your breathlessness gets much worse when you go from lying down to standing, or that you feel your heart racing in your chest after minor position changes, it is worth mentioning to your doctor specifically, because POTS has its own management strategies that differ from standard breathlessness treatments.

Chest Wall Pain That Mimics Lung Problems

Fibromyalgia is, at its core, a condition of widespread pain. The chest wall is not exempt. The muscles, cartilage, and joints of the ribcage can become painful, and that pain can make breathing feel restricted or alarming. Musculoskeletal chest wall disorders, including conditions historically grouped under the term “fibrositis” (an older name closely related to fibromyalgia), are a recognized cause of chest pain that is frequently mistaken for more serious problems like angina or pleurisy.¹⁰

When your chest wall hurts, you instinctively guard the area by taking shallower breaths to avoid triggering pain. This voluntary breath-holding compounds the effects of the muscle weakness and altered breathing patterns already present. The result is that pain in the chest wall and shortness of breath become entangled: the pain limits breathing depth, the shallow breathing contributes to air hunger, and the sensation of not getting enough air can trigger anxiety, which causes more chest tightness. Patients sometimes end up in emergency rooms convinced they are having a cardiac event, only to be told their heart and lungs are fine. That reassurance is important, but it does not erase the symptom, and many people leave without a clear explanation of why they felt so breathless.

Sleep Apnea as an Overlooked Contributor

One piece of the breathlessness puzzle that gets surprisingly little attention is obstructive sleep apnea. A study comparing fibromyalgia patients to controls found that half of the fibromyalgia group met the criteria for obstructive sleep apnea, with the severity distributed across mild, moderate, and severe categories. There were also correlations between lower oxygen saturation during sleep and worse fibromyalgia symptom scores.¹¹

Sleep apnea fragments your sleep and starves your body of oxygen repeatedly throughout the night. If you already have fibromyalgia, poor sleep amplifies pain and fatigue, which in turn promotes physical deconditioning and worsened breathing muscle function during the day. Many fibromyalgia patients attribute their morning exhaustion and daytime breathlessness entirely to fibromyalgia itself, never considering that an untreated sleep-breathing disorder could be piling on. If you snore loudly, wake with headaches, or feel unrefreshed no matter how long you sleep, asking about a sleep study is reasonable.

Inflammation, Mitochondria, and the Energy Connection

Emerging research suggests that fibromyalgia involves chronic low-grade inflammation and possible mitochondrial dysfunction. Elevated levels of pro-inflammatory signaling molecules have been found in fibromyalgia patients, and these inflammatory signals are thought to sensitize pain pathways and amplify symptoms across the body.¹² Fibromyalgia also overlaps biologically with conditions like chronic fatigue syndrome and long COVID in ways that point toward shared problems with cellular energy production, immune regulation, and oxidative stress.¹³

How does this connect to breathlessness? If your muscles, including the muscles that power breathing, are not producing energy efficiently at the cellular level, they fatigue more quickly and generate less force. This is still an area where the research is moving faster than the conclusions, but the idea that fibromyalgia involves a systemic energy deficit rather than just a pain-processing problem could help explain why so many patients feel breathless doing things that should not tax their cardiovascular system.

What Actually Helps

The encouraging news is that breathlessness in fibromyalgia responds to exercise and targeted training. A randomized controlled trial of aerobic exercise in women with fibromyalgia found substantial improvements in lung function: forced vital capacity improved by about 10% in the exercise group versus 5% in controls, total lung capacity rose by about 11% versus 5%, and breathlessness scores dropped by roughly 38% in the exercise group compared to 19% in controls. Physical and mental quality-of-life scores also improved more with aerobic exercise.¹⁴ These are meaningful changes for something as simple as structured aerobic activity.

Respiratory muscle training, where you practice breathing against resistance using a handheld device, has also shown promise. A systematic review with meta-analysis found that respiratory muscle training improved pain, quality of life, fatigue, anxiety, sleep quality, and breathing muscle strength in fibromyalgia patients compared to control groups. However, the researchers rated the certainty of this evidence as very low, meaning the findings are suggestive but not settled.¹⁵ The improvements went beyond breathing itself: pain scores, fatigue, and sleep all improved, which makes sense if respiratory dysfunction and other fibromyalgia symptoms share common roots in deconditioning, autonomic dysfunction, and central sensitization.

Starting exercise when you already feel breathless and fatigued is genuinely hard, and fibromyalgia patients often experience symptom flares after overdoing it. The research consistently supports low-to-moderate intensity exercise that increases gradually, rather than jumping into an aggressive routine. Walking, swimming, cycling, and water aerobics are commonly recommended because they allow you to control intensity and reduce impact on painful joints. The goal is not to push through pain but to slowly rebuild the cardiovascular and respiratory fitness that chronic pain and inactivity have eroded.

When Breathlessness Needs a Workup

Because fibromyalgia-related breathlessness closely mimics symptoms of cardiac and pulmonary disease, it is important not to assume that every episode of shortness of breath is “just fibromyalgia.” New-onset breathlessness, breathlessness that worsens suddenly, chest pain with exertion, or breathlessness accompanied by swelling in your legs, coughing up blood, or fainting should always be evaluated. Standard tests like spirometry, chest X-rays, and electrocardiograms can rule out asthma, COPD, heart failure, pulmonary embolism, and other conditions that require their own treatments.

If those tests come back normal and you have an established fibromyalgia diagnosis, the breathlessness likely falls into the pattern described in this article: a combination of weakened respiratory muscles, altered breathing patterns, autonomic dysfunction, deconditioning, and possibly chest wall pain. Naming the mechanism can itself be therapeutic. Many fibromyalgia patients spend years worried that something dangerous is being missed, and understanding that the symptom has identifiable physical explanations, even if those explanations do not show up on a standard lung test, can reduce the anxiety component that makes the breathlessness worse.