Morning stiffness is a clinical condition in which the tissues around the affected joints become oozing, congested, and edematous during sleep or reduced activity due to the inflammatory joint disease of the patient, causing tension in the muscle tissues around the joints, which in turn causes stiffness and discomfort. Upon awakening, as the muscles contract, the edematous fluid is reabsorbed by the lymphatics and small veins, and the morning stiffness is relieved. Usually, morning stiffness can be seen in almost all inflammatory joint diseases, but the most common ones in clinical practice are rheumatoid arthritis, osteoarthritis, ankylosing spondylitis, etc. 1. Rheumatoid arthritis: In clinical practice, patients with rheumatoid arthritis have more frequent and obvious symptoms of morning stiffness, which last for more than one hour. When the disease is in remission, the duration of morning stiffness will be shortened and the degree will be reduced, so morning stiffness is an important indicator of the degree of activity of rheumatoid arthritis disease; 2, osteoarthritis: common osteoarthritis in the elderly, there will also be morning stiffness of the affected joints, but the duration is relatively short, mostly relieved in about 5-10 minutes. In addition, some patients soak their hands in hot water, the symptoms of morning stiffness will also be reduced; 3, ankylosing spondylitis: morning stiffness is mainly in the lower back, and some patients will be accompanied by nocturnal pain, the onset of the population is mainly young and strong men; 4, other diseases: psoriatic arthritis, reactive arthritis, some patients with fibromyalgia syndrome, the same will also appear morning stiffness symptoms. In daily life, if patients have morning stiffness in some joint parts, consider the existence of joint-related inflammation, and should go to the rheumatology and immunology department of the hospital as soon as possible to clarify the specific cause and then carry out targeted treatment.