Assertion: rheumatoid arthritis's joint | /r/Causes | stiffness
Facets:
Source sentences:
text: In addition, the constant friction causes new bone growth to develop around the joints, which causes stiffness and limits joint movement.
text: When the immune system attacks itself, the result is inflammation in a joint that can cause pain, stiffness, and mobility problems.
text: The life expectancy for rheumatoid arthritis (RA), a serious autoimmune disease that targets the joints causing inflammation, pain, and stiffness, depends on many factors.