<qa>  How many FMS patients report that pain is the primary symptom that limits their ability to workFMS affects about 5 of the general population and occurs most often in women between the ages of 20 and 50 years old. Overall, more than 80 of FMS patients report that pain is the primary symptom that limits their ability to work, about 30 of patients are disabled, and about 45 collect Social Security Disability insurance. Conventional treatments, which include pharmacological and behavioral interventions, fail to provide adequate pain relief in more than half of FMS patients, strongly suggesting the need for improved treatment options. 