Fibromyalgia causes chronic, widespread pain along with a cluster of other symptoms that can affect sleep, thinking, mood, and sensory processing. It affects roughly 1 to 5 percent of the population, and women are diagnosed three to six times more often than men. Because there’s no single lab test for it, recognizing the full picture of symptoms is often the first step toward getting a diagnosis.
Widespread Pain That Doesn’t Let Up
The defining symptom of fibromyalgia is pain spread across multiple areas of the body. It’s commonly felt in the arms, legs, head, chest, abdomen, back, and buttocks. People often describe it as aching, burning, or throbbing, and it can shift in location and intensity from day to day. To meet current diagnostic criteria, pain must be present in at least four of five body regions and must have persisted at a similar level for at least three months.
This isn’t the kind of pain that follows an injury or shows up on an X-ray. It’s driven by changes in how the nervous system processes pain signals, which is why it tends to be widespread rather than localized to one joint or muscle. The pain can worsen with physical activity, stress, weather changes, or poor sleep, and it rarely disappears entirely, even on good days.
Fatigue That Sleep Doesn’t Fix
Fatigue in fibromyalgia goes well beyond feeling tired. Many people wake up feeling as though they haven’t slept at all, regardless of how many hours they spent in bed. This is sometimes called non-restorative sleep: you get the quantity, but the quality is poor. Research comparing people with fibromyalgia to matched controls found that after a night of non-restorative sleep, healthy individuals recovered relatively quickly during the day. People with fibromyalgia did not. Both physical and mental fatigue persisted throughout the entire day, making it harder to function from morning to night.
The fatigue often feels like a weight on the body. Some people compare it to the exhaustion of a bad flu. It can limit your ability to exercise, work, or handle everyday tasks like cooking or running errands, which creates a frustrating cycle: less activity leads to more deconditioning, which leads to more fatigue.
Cognitive Difficulties (“Fibro Fog”)
Many people with fibromyalgia report problems with thinking and memory that are collectively known as “fibro fog.” The most common complaints include forgetfulness and difficulty retaining new information, trouble concentrating or feeling mentally alert, a reduced ability to think quickly (especially in distracting environments), and difficulty holding conversations or retrieving the right words. You might walk into a room and forget why, struggle to follow a meeting at work, or find that reading a book feels far harder than it used to.
These cognitive symptoms tend to be worse on days when pain and fatigue are also flaring. Research suggests that non-restorative sleep plays a role here too, though the connection between poor sleep and next-day cognitive function in fibromyalgia is complex and varies from person to person.
Heightened Sensitivity to Sound, Light, and Touch
Fibromyalgia doesn’t just amplify pain. It can make the nervous system more reactive to all kinds of sensory input. Bright lights, loud noises, strong smells, and temperature extremes can all feel overwhelming or physically uncomfortable. In one study, researchers measured how much sound pressure was needed for participants to rate noise as mild, moderate, or intense. People with fibromyalgia needed significantly lower sound levels to report the same loudness ratings as healthy controls, confirming that their auditory processing was genuinely amplified, not imagined.
The same pattern holds for heat and mechanical pressure. Quantitative sensory testing has shown increased sensitivity to both in fibromyalgia patients compared to people without the condition. In practical terms, this might mean that a firm handshake feels painful, a slightly warm shower feels scalding, or the hum of fluorescent lights in an office becomes intolerable.
Numbness and Tingling
Pins-and-needles sensations are more common in fibromyalgia than many people realize. In one clinic-based survey, about 56 percent of fibromyalgia patients reported experiencing numbness and tingling. For roughly a third, these sensations were limited to one or two areas. For about 22 percent, the tingling was diffuse, showing up across multiple body regions. It could be constant, intermittent, or frequent depending on the person.
These sensations can be alarming because they mimic symptoms of nerve damage or conditions like multiple sclerosis. If you’re experiencing new or worsening numbness, it’s worth having it evaluated to rule out other causes, but paresthesia on its own is a recognized part of the fibromyalgia symptom profile.
Depression and Anxiety
Mood disorders overlap heavily with fibromyalgia. A large meta-analysis pooling data from tens of thousands of patients found that roughly 51 percent of people with fibromyalgia meet criteria for depression and about 47 percent experience clinical anxiety. These aren’t simply a reaction to living with chronic pain, though that certainly plays a role. Fibromyalgia and mood disorders share overlapping pathways in how the brain processes pain, stress, and emotion, which means the conditions can feed into each other.
Depression in fibromyalgia can look like persistent low mood, loss of interest in activities, or a sense of hopelessness about the future. Anxiety often manifests as excessive worry, restlessness, or a feeling of being on edge. Both can worsen pain perception and fatigue, creating a cycle that’s hard to break without addressing all the symptoms together.
Overlapping Conditions
Fibromyalgia rarely travels alone. Between 39 and 76 percent of people with fibromyalgia also have at least one other chronic pain condition. The most common include irritable bowel syndrome (IBS), chronic tension-type or migraine headaches, temporomandibular joint disorders (jaw pain and stiffness), and myofascial pain syndrome. These overlapping conditions can make it harder to pin down what’s causing which symptom, and they tend to reinforce one another. A bad IBS flare can worsen sleep, which worsens pain, which worsens everything else.
How Fibromyalgia Is Diagnosed
There is no blood test, imaging scan, or biopsy that confirms fibromyalgia. Diagnosis is based on your symptom pattern. Under the current criteria (revised in 2016), a doctor evaluates two things: how widespread your pain is and how severe your other symptoms are. Pain must be present in at least four of five body regions and must have been consistent for at least three months. A scoring system then weighs the number of painful areas against the severity of fatigue, cognitive symptoms, and unrefreshing sleep to determine whether the overall picture meets the threshold.
Part of the diagnostic process involves ruling out other conditions that can mimic fibromyalgia. Autoimmune diseases like lupus or rheumatoid arthritis, thyroid disorders, and vitamin deficiencies can all cause widespread pain and fatigue. Red flags that point toward something other than fibromyalgia include unexplained weight loss, frequent infections, joint swelling, or progressive muscle weakness. These warrant specific testing to ensure nothing else is being missed, since fibromyalgia can also coexist with other rheumatologic conditions.