Disabilities are faked for many reasons, including getting court awards, out-of-court settlements, drugs, and even sympathy and attention. When someone deliberately fakes an illness or condition, it's called malingering. When it's done unintentionally, we call it illness behavior.
Some doctors say exagerating pain may give some patients time out from work and other ies. Psychologic or social problems may be the real cause of the symptoms. For the patient, the symptoms still may be very real.
We don't have one single test to answer this question for sure. There are several tests to help give better information. Doctors and therapists perform this kind of exam. Researchers in Iceland have a new test called The Fly to show when head and neck motions are normal. In time this test may be used to find fakers.
Employees out on work-related injuries usually have a case manager. You may want to contact that person with your questions and concerns.