Morning stiffness must be rheumatoid?

Rheumatology is a group of diseases that invade joints, bones, muscles, blood vessels and related soft tissues or connective tissues, most of which are autoimmune diseases. Morning stiffness must be rheumatoid disease, I clearly answer you not, because many related joint diseases, will cause morning stiffness, such as osteoarthritis, rheumatoid arthritis, joint damage caused by other diseases, may cause morning stiffness this performance, so morning stiffness is not necessarily rheumatoid arthritis.