Rheumatoid is a disease, and morning stiffness is a clinical manifestation. Although rheumatoid patients can experience morning stiffness, a variety of other diseases can cause this symptom, so morning stiffness does not necessarily mean rheumatoid. Morning stiffness refers to the stiffness of joints and surrounding tissues after waking up in the morning, mainly caused by damage to diseased joints. During sleep or reduced activity, the tissues around the affected joints become oozing, congested and edematous, causing tension in the muscle tissues around the joints, which in turn causes the joints to feel swollen, stiff and uncomfortable. Rheumatoid arthritis, also known as rheumatoid arthritis, is an autoimmune disease characterized by aggressive symmetric polyarthritis. The disease starts slowly, with symmetrical involvement of both hands, especially the metacarpophalangeal and proximal interphalangeal joints of both hands, and painful swelling of multiple joints such as the wrist and foot joints, often accompanied by morning stiffness. Among patients with rheumatoid arthritis, the symptoms of morning stiffness are relatively prominent and last for a long time, usually more than an hour, and morning stiffness can be used as one of the activity indicators to observe the disease. In addition, some other arthritis, such as psoriatic arthritis, ankylosing spondylitis, fibromyalgia syndrome, etc., can also show clinical symptoms of morning stiffness of joints. If a patient develops morning stiffness and suspects that he or she has rheumatoid arthritis, he or she needs to observe the location of the affected joints, the number of affected joints, and the results of positive autoantibodies such as rheumatoid factor, as well as the results of inflammatory indicators such as blood sedimentation and C-reactive protein. The diagnosis of rheumatoid rheumatism can be made only after a comprehensive judgment.