Morning stiffness may be an early sign of rheumatic immune diseases, osteoarthritis and other diseases. 1. Rheumatic immune disease: due to prolonged inactivity of the body, body fluids leak out from the capillaries of the affected joints, resulting in tissue congestion, edema or oozing. Therefore, it is necessary to wait until the stiff part of the full activity, edema fluid is absorbed by the lymphatic vessels and small veins, the stiffness can be reduced or even disappeared. Such as rheumatic polymyalgia, rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis and so on. 2. Osteoarthritis: Osteoarthritis is a chronic joint disease characterized by degenerative changes in articular cartilage and secondary bone hyperplasia, the etiology of which is still unclear. It occurs in the knee and hip joints, which are heavily loaded. Clinically, it is characterized by progressive joint pain, morning stiffness and joint enlargement. Therefore, morning stiffness may be an early sign of osteoarthritis. Morning stiffness may also be an early sign of other diseases, and it is recommended that when patients experience morning stiffness, they should seek medical treatment in a regular hospital in time to avoid delaying their condition.