Ever feel like your entire body is staging a protest, leaving you completely exhausted, no matter how much sleep you catch? If that deep, widespread ache refuses to leave for months at a time, you might be dealing with a chronic condition called fibromyalgia. As the Mayo Clinic explains, it is a long-lasting illness characterized by widespread muscle pain, relentless fatigue and a frustrating mental cloudiness often referred to as “brain fog.”
For a long time, the root cause of this discomfort was a massive medical mystery, but thankfully, healthcare providers today fully recognize that the pain is entirely real. While there isn’t a single “smoking gun” cause, scientists have discovered that a unique mix of genetic, physical and environmental factors usually triggers the condition. Let’s take a look at the primary reasons why fibromyalgia develops.
1. Brain and nerve changes
Surprisingly, the primary culprit behind fibromyalgia resides right inside your head. Think of your brain and nervous system as your body’s built-in security system. Normally, when you experience a minor injury, your nerves flash a quick signal to your brain, the alarm rings and you register the pain so you can protect yourself.
However, research highlights that for those with fibromyalgia, this alarm system experiences a major glitch. The brain becomes hypersensitive, essentially cranking the volume on pain signals all the way up and locking it there. Because this internal amplifier is stuck on high, ordinary sensations that shouldn’t hurt at all (like a gentle touch, a friendly hug or a basic stretch) are misinterpreted by the brain as sharp, intense pain.
2. Family genetics
Like many health problems, fibromyalgia can be passed down in families. If your mother or sister has this sickness, you have a much higher chance of getting it, too, Harvard Health Publishing explains. Scientists believe there are special genes (the tiny building blocks that make you who you are) that make some people more likely to feel pain strongly.
Think of these genes like a volume knob on a radio. For people with this sickness, the “pain volume” is turned up way too loud. But just because your family has these genes does not mean you will definitely get sick. Usually, something else has to happen first to “wake up” the sickness. This could be a bad fall, getting a different bug or virus or going through a very stressful time.
3. Severe sickness and infections
Sometimes, fibromyalgia starts right after you get over a very bad sickness. The Cleveland Clinic notes that certain viral or bacterial infections can trigger fibromyalgia. Even after the cold or flu goes away, your immune system and nerves stay inflamed, leading to long-lasting body pain.
It is like your body’s alarm system gets stuck in the “ON” position. When a bug gets inside you, your body fights hard to keep you safe. But for some people, the body forgets to turn the alarm off when the fight is over. Your brain keeps sending out warning signals, making you feel achy, sore and tired even though the sickness is already completely gone.
4. Physical or emotional trauma
The onset of fibromyalgia is frequently linked to profound physical or psychological trauma that essentially acts as a catalyst, “flipping a switch” within the central nervous system. As medical experts and health platforms like Healthline point out, many individuals can trace the beginning of their chronic pain back to a specific, highly distressing physical event, such as surviving a severe automobile accident or undergoing a major, invasive surgery.
However, the trigger does not always have to be a physical injury; severe emotional trauma can be just as impactful. Going through deeply painful life events – such as grieving the sudden loss of a loved one or enduring a toxic, high-stress work environment for years – can fundamentally alter the way your brain communicates with your body. This intense, sustained strain disrupts normal neurological pathways, making the brain hyperreactive.
How do doctors confirm fibromyalgia?
Receiving a diagnosis for fibromyalgia can be a complex and often exhausting journey for patients, primarily because there is no quick blood test, advanced imaging scan or X-ray that definitively proves the condition exists. Instead, healthcare providers must rely on a thorough clinical evaluation to confirm the diagnosis, asking detailed questions about your medical history, sleep quality, cognitive function and daily physical well-being.
According to guidelines from the Centers for Disease Control and Prevention (CDC), a doctor will typically consider a fibromyalgia diagnosis if you have experienced widespread pain throughout your entire body for more than three months, alongside persistent fatigue and unrefreshing sleep. Because these symptoms heavily overlap with other chronic illnesses, doctors must also systematically rule out alternative conditions (such as rheumatoid arthritis, lupus or thyroid disorders) before a definitive fibromyalgia diagnosis can be reached.
Does fibromyalgia get worse with age?
Fibromyalgia is not a disease that destroys your body over time, so it does not permanently ruin your muscles or joints as you get older. However, the pain can go up and down; some days will feel wonderful, and other days will feel very hard, depending on your stress levels and how well you sleep.
As you grow older, your body naturally gets a little more tired and stiff. Because of this, it might feel like the sickness is getting worse, even when it is just normal aging. The good news is that many people actually get better at managing their pain over the years. They learn exactly what their bodies need, like gentle stretching, warm baths or quiet breaks, to keep the bad days away and still enjoy life.
What calms down fibromyalgia?
Dr. Justus Rabach, MD, tells Blavity Health, “The best way to calm the pain is to use gentle movement and build great sleep habits. Doing soft exercises like walking, swimming, or stretching helps keep your muscles from getting stiff. Going to bed at the same time every night and finding ways to lower your daily stress will also calm your brain’s alarm system down.”
Also, taking a warm bath or using a heating pad can feel really good. The warmth hugs your muscles and helps them release the tightness. Remember to be kind to yourself on the bad days. Resting in a quiet, dark room or just talking to a good friend can make a big difference when your body feels tired and sore, as noted by the American Brain Foundation.
“If we understand the mechanism, we may come up with new and potentially better forms of treatment,” said Marina López-Solà, Ph.D., of the Department of Psychology and Neuroscience at the University of Colorado, Boulder.
Bottom line
Fibromyalgia is a real and painful sickness caused by a mix of genetics, severe stress, bad infections and changes in how your brain feels pain. While the brain’s “pain alarm” gets stuck on a high volume, the sickness does not destroy your joints as you age. By working with a doctor to lower stress, improve sleep and move gently, you can turn the pain volume down and feel better.
Frequently Asked Questions
Can fibromyalgia be detected by blood tests?
No, no blood test can show fibromyalgia, but doctors will still take your blood to make sure you do not have a different sickness instead.
Where is most fibromyalgia pain located?
The pain is felt all over the body, but it is usually worst in the neck, shoulders, back, hips and arms.
Are lupus and fibromyalgia the same?
No, they are different: lupus is a disease in which your body attacks its own healthy tissues and causes damage, while fibromyalgia causes severe pain without damaging the body’s tissues.
Citations
Mayo Clinic. Fibromyalgia. Mayo Clinic. Published 2021. https://www.mayoclinic.org/diseases-conditions/fibromyalgia/symptoms-causes/syc-20354780
Michels EAM, Gilbert S, Koval I, Wekenborg MK. Alarm fatigue in healthcare: a scoping review of definitions, influencing factors, and mitigation strategies. BMC Nursing. 2025;24(1). doi:https://doi.org/10.1186/s12912-025-03369-2
Harvard Health Publishing. Is fibromyalgia hereditary? Harvard Health. Published August 1, 2019. https://www.health.harvard.edu/pain/is-fibromyalgia-hereditary
Cleveland Clinic. Fibromyalgia. Cleveland Clinic. Published December 1, 2022. https://my.clevelandclinic.org/health/diseases/4832-fibromyalgia
Gillette H. What’s the Connection Between Fibromyalgia and Trauma? Healthline. Published May 5, 2023. https://www.healthline.com/health/fibromyalgia/fibromyalgia-and-trauma
Chadwick AL, Shi C, McMillan M, Miller J, Hu J, Geiger PC. The impact of a heat therapy intervention on pain and fibromyalgia symptoms in patients with fibromyalgia: a pilot study. Frontiers in Pain Research. 2025;6. doi:https://doi.org/10.3389/fpain.2025.1526491
CDC. Fibromyalgia | CDC. Cdc.gov. Published September 23, 2025. https://www.cdc.gov/chronic-disease/fibromyalgia/index.html
American Brain Foundation. What Is Fibromyalgia? | American Brain Foundation. American Brain Foundation. Published January 29, 2025. https://www.americanbrainfoundation.org/diseases/fibromyalgia/