One of the most elusive and difficult to diagnose conditions is the disease known as fibromyalgia. It manifests itself in a variety of uncomfortable and painful ways from fatigue to complete body pain to depression and anxiety to headaches. Because of something called abnormal pain perception processing, those suffering from fibromyalgia experience a heightened response to pain, much more severe than those who don't. It affects about 4 million adults in the United States.
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