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The answer of that question is unclear yet. Some experts think that psychological problems such as stress have a role in increasing the risk, particularly if followed with poor physical condition.
One theory speculates about the decreased level of serotonin (a brain neurotransmitter). It can help provide anxiety-reducing reaction. Low level of serotonin can increase the sensitivity to pain. And some studies confirmed that stress and serotonin are linked,
Though the way of fibromyalgia to start may vary, both genetics and emotional stressors are thought as the major triggers. If you have genetic tendency of this disease, the disease is more likely to occur when you get exposed to certain physical or psychological stressors such as serious illness or traumatic event.
Several years ago, it was thought that there might be a link between mental health issues (such as depression) and fibromyalgia since sometimes both conditions was found together in one individual. But today, the link of both conditions is no longer thought.
However, depression can be a complication from fibromyalgia. Even in a few cases, it can lead to social isolation. Anxiety and depression also can worsen the symptoms.
While having good sleep is so essential for people with fibromyalgia, the symptoms of the disease such as pain can cause sleep deprivation or even insomnia. In fact, many sufferers experience a wide range of sleep problems.
Like in stress, sleep problems can be potential to cause lower serotonin levels. And this can cause increased pain sensitivity, making the symptom worse.