Yes, fibromyalgia commonly causes burning sensations on or under the skin. This type of pain is one of several sensory disturbances grouped under the term “dysesthesia,” and it results from the way fibromyalgia changes how the nervous system processes signals. The burning can feel like sunburn, a hot surface pressed against the skin, or a diffuse warmth radiating through muscle tissue, even when nothing external is causing it.
Why Fibromyalgia Produces Burning Pain
Fibromyalgia is fundamentally a disorder of pain processing. The central nervous system becomes hypersensitive through a process called central sensitization, where spinal cord neurons ramp up their responsiveness to incoming signals. Normally, a mild stimulus like warm water or light pressure registers as harmless. In fibromyalgia, those same signals get amplified and misinterpreted as painful.
This amplification happens through a specific chain of events. Repeated stimulation of pain-carrying nerve fibers (called C-fibers) activates receptors on spinal cord neurons that open the door to calcium. That calcium triggers a cascade: the production of nitric oxide, which in turn causes the release of substance P, a chemical that lowers the threshold for pain signaling. Substance P can spread across multiple segments of the spinal cord, sensitizing neurons far from the original input. The result is that innocuous warmth or light touch can register as burning pain, and actual pain feels dramatically worse than it should.
Research on thermal sensitivity illustrates this clearly. In one study, a fibromyalgia patient rated a skin temperature of just 33.7°C (about 93°F, barely above body temperature) as moderately painful, while healthy controls didn’t report pain until temperatures exceeded 52°C (126°F). Even more striking, brief exposure to moderate heat triggered long-lasting sensitization, meaning subsequent neutral temperatures were then perceived as painful. This isn’t simply an exaggerated version of normal pain. It represents a qualitatively different way the nervous system encodes sensation.
The Role of Small Nerve Fiber Damage
Beyond central sensitization, there’s a physical component in the skin itself. About 70% of fibromyalgia patients show measurable loss of small nerve fibers in skin biopsies. These are the tiny nerve endings responsible for detecting temperature and pain. In fibromyalgia, this nerve loss tends to follow a proximal pattern, meaning it’s more pronounced in areas closer to the trunk (thighs, upper arms, torso) rather than in the hands and feet.
This pattern differs from small fiber neuropathy, a separate condition where nerve loss concentrates in the feet and lower legs and typically produces burning, tingling, or numbness that starts at the toes and works upward. The distinction matters because the two conditions require different treatment approaches. If your burning is worst in your feet and lower legs, especially if you have diabetes or prediabetes, small fiber neuropathy may be contributing alongside or instead of fibromyalgia.
Where the Burning Typically Occurs
Fibromyalgia pain, including burning, tends to be widespread rather than confined to one spot. The diagnostic criteria require pain in at least four of five body regions: left upper body, right upper body, left lower body, right lower body, and the spine/trunk area. C-fiber activation in fibromyalgia often results in poorly localized, diffuse pain sensations, which is why the burning can feel like it’s everywhere or shift unpredictably from one area to another.
That said, many people experience burning more intensely in certain zones. The upper back, shoulders, thighs, and arms are common areas, consistent with the proximal pattern of nerve fiber loss described above. Some people describe it as a surface-level skin burn, while others feel it deeper in the muscles. Both experiences are typical.
Temperature and Other Triggers
If you’ve noticed that weather changes make your burning worse, you’re not imagining it. Fibromyalgia significantly lowers the thresholds at which temperature becomes painful. People with fibromyalgia experience heat pain at an average of 41.1°C (106°F) compared to 45.2°C (113°F) in healthy individuals. For cold, the gap is even larger: fibromyalgia patients feel pain at around 19.7°C (67°F), while healthy controls don’t report cold pain until about 8.4°C (47°F).
Both hot and cold ambient temperatures can intensify burning sensations and overall pain. A 2020 study found that both extremes act as triggers for pain, discomfort, and distress. Unlike healthy individuals who gradually adapt to sustained temperature exposure, people with fibromyalgia don’t habituate. Prolonged cold or heat continues to aggravate symptoms rather than fading into the background. Genetic variants in temperature-sensing receptors (specifically TRPA1) have been identified in fibromyalgia patients who report extreme cold-triggered pain, suggesting a biological basis for this sensitivity.
Other common triggers for burning flares include clothing that creates friction or pressure, hot showers or baths, physical exertion, stress, and poor sleep. Anything that increases nervous system arousal can temporarily worsen central sensitization.
How Burning Differs From Normal Pain Responses
Two phenomena explain why fibromyalgia burning feels so disproportionate. The first is hyperalgesia: a painful stimulus hurts far more than it should. The second is allodynia: a stimulus that shouldn’t hurt at all, like a light touch or room-temperature air, registers as pain.
A concept called “wind-up” drives much of this. When identical painful stimuli are delivered to the skin more than once every three seconds, pain perception progressively increases in fibromyalgia patients rather than staying the same. In one experiment, 83% of fibromyalgia patients still rated after-sensations as painful 15 seconds after heat was removed, compared to 37% of healthy controls. Two minutes after stimulation, 55% of fibromyalgia patients still felt pain versus only 5% of controls. The nervous system keeps amplifying a signal long after the original stimulus is gone.
Managing Burning Sensations
Treatment targets the underlying nervous system dysfunction rather than the burning itself. Three categories of medication are most commonly used. Anti-seizure drugs like pregabalin (Lyrica) work by calming overactive nerve signaling and are specifically approved for fibromyalgia. Certain antidepressants, particularly duloxetine (Cymbalta) and milnacipran (Savella), increase levels of brain chemicals that help dampen pain signals. These can reduce burning and fatigue even if you don’t have depression. Older tricyclic antidepressants like amitriptyline are sometimes prescribed at low doses for pain and sleep. Standard over-the-counter pain relievers like ibuprofen or acetaminophen offer modest help for some people but don’t address the central sensitization driving the burning. Opioids are not recommended because they can worsen pain sensitivity over time.
For localized burning, topical capsaicin cream (0.075% strength) applied three times daily has shown short-term improvement over six weeks in severely affected patients. Capsaicin works by initially activating and then depleting the very nerve chemicals responsible for transmitting pain signals. The cream itself causes a burning sensation for the first few applications before the desensitizing effect kicks in, which can be a tough sell when burning is already your primary complaint, but the trade-off often proves worthwhile.
Beyond medication, managing triggers plays a significant role. Wearing loose, soft-textured clothing reduces friction-driven flares. Keeping indoor temperatures moderate and consistent helps avoid the thermal triggers that lower your pain threshold. Regular low-impact movement like walking or swimming can gradually reduce central sensitization over time, though it may temporarily increase symptoms before it helps. Sleep quality has an outsized effect on pain processing, so addressing sleep disruption often reduces the intensity of burning and other pain types.