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Fibromyalgia Symptoms, Fibromyalgia symptoms may begin after you've had a physical injury, surgical treatment, infection, or extreme tension. But you may see signs develop with time for no particular factor. Symptoms may include: Muscle pain throughout the body, Tenderness at specific points, Pain that: Ranges from moderate discomfort to extreme sufficient to restrict day-to-day activities, Frequently happens in the neck, upper back, shoulders, chest, rib cage, lower back, and thighs, May feel like a burning, gnawing, throbbing, stabbing, or aching, May come on slowly, Might seem even worse when you attempt to relax and is less visible throughout activity, Fibromyalgia Causes, The standard causeof fibromyalgia is still unknown. Possible causes include: Problems in the way your brain and nerves procedure discomfort. Experts do not know what causes this. Nerve stimulation might cause you to have high levels of brain chemicals called neurotransmitters. Fibromyalgia and costochondritis cause modifications in how your brain views pain. You might feel uncomfortable responses to moderate causes.