Often a long-lasting or chronic disorder, Fibromyalgia causes pain and often tenderness throughout the body. Women are twice as likely to be affected by fibromyalgia as men. Treatment is difficult because misdiagnosis of rheumatoid arthritis or thyroid disease is common -- the symptoms of the conditions are similar. Additionally, around 30% of those with rheumatoid arthritis also have fibromyalgia, further complicating diagnosis. The condition is also frequently associated with anxiety and depression.

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