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It's not clear why some people develop fibromyalgia. The exact cause is unknown, but it's likely that a number of factors are involved.
Here are some of the main factors thought to contribute to the condition:
One of the main theories is that people with fibromyalgia have developed changes in the way the central nervous system processes the pain messages carried around the body. This could be due to changes to chemicals in the nervous system.
The central nervous system (brain, spinal cord and nerves) transmits information all over your body through a network of specialised cells. Changes in the way this system works may explain why fibromyalgia results in constant feelings of, and extreme sensitivity to, pain.
Research has found that people with fibromyalgia have abnormally low levels of the hormones serotonin, noradrenaline and dopamine in their brains.
Low levels of these hormones may be a key factor in the cause of fibromyalgia, as they're important in regulating things such as:
These hormones also play a role in processing pain messages sent by the nerves. Increasing the hormone levels with medication can disrupt these signals.
Some researchers have also suggested that changes in the levels of some other hormones, such as cortisol (which is released when the body is under stress), may contribute to fibromyalgia.
It's possible that disturbed sleep patterns may be a cause of fibromyalgia, rather than just a symptom.
Fibromyalgia can prevent you from sleeping deeply and cause fatigue (extreme tiredness). People with the condition who sleep badly can also have higher levels of pain, suggesting that these sleep problems contribute to the other symptoms of fibromyalgia.
Research has suggested that genetics may play a small part in the development of fibromyalgia, with some people perhaps more likely than others to develop the condition because of their genes.
If this is the case, genetics could explain why many people develop fibromyalgia after some sort of trigger.
Fibromyalgia is often triggered by a stressful event, including physical stress or emotional (psychological) stress. Possible triggers for the condition include:
However, in some cases, fibromyalgia doesn't develop after any obvious trigger.
There are several other conditions often associated with fibromyalgia. Generally, these are rheumatic conditions (affecting the joints, muscles and bones), such as:
Conditions such as these are usually tested for when diagnosing fibromyalgia.