Chronic Pain Conditions and Family

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I have as my of my mylot friends know a Chronic pain condition called Reflex Sympathetic Dystrophy. It is Similar in nature to Fibromyalgis but has a add feature of nerve pain. This past year my Aunt (My mother's sister) was diagnosed with fibromyalgia, and her daughter has TMJ and other chronic pain including Chronic back pain. My question is, if multiple blood relatives have chronic of sum-sort are their genes more to proun to these conditions of is it a genetic flaw or inhereted defect??