Original sentence: A 2007 review states that 25-30% of diagnosed fibromyalgia cases may be due to malingering, and a review of personal injury claims finds that 35-39% of fibromyalgia and chronic fatigue syndrome claims appear to be feigned, based on clinicians' impressions of "multiple sources of evidence, including reported severity, illness patterns, cognitive impairment inconsistent with the purported condition, and discrepancies among records, self-report, and observed behavior.A significant percentage of reported cases may be due to malingering, a type of fraud wherein a patient feigns having an illness or exaggerates symptoms for non-medical personal gain (often financial), including obtaining access to prescription drugs for recreational use or for illegal resale.Because there is currently no completely objective clinical test for fibromyalgia, and "because everyone has had the experience of pain and therefore knows how it should appear to others," fibromyalgia is thought to be relatively easy to simulate
Edited sentence: Because there is currently no completely objective clinical test for fibromyalgia, and perhaps because of pervasive discounting of women's experience of pain, many medical professionals do not believe fibromyalgia is real despite the fact that the American Medical Association recognized fibromyalgia as an illness and major cause of disability in 1987.It is common for fibromyalgia pain sufferers to have sought treatment for nine years or more before receiving the diagnosis.This ignorance on the part of medical professionals is itself a further cause of despair for many with fibromyalgia