Fibromyalgia can be caused by trauma, stress, an illness, PTSD, or fever. And yes, it can run in families.
Fibromyalgia should be suspected by the pcp when the pt has widespread pain for more than 3 months. There are trigger/tender points in the same places on both sides of the body.
Wrists, ankles, neck, shoulders, elbows, buttocks, knees are the most common. Also migraine headaches and stomach issues such as IBS. Muscle spasms are also common.