What does the term illness behavior mean?
Illness behavior is a part of human illness. However, it can be out of proportion to the physical problem and then becomes counter productive. Illness behavior can be an expression of emotional or psychological distress that some conclude can be important in the development and maintenance of chronic pain.
Apeldoorn et al. The reliability of nonorganic sign-testing and the Waddell score in patients with chronic low back pain. SPINE. Volume 33. Number 7. Pp. 821-826.