There are many causes of morning stiffness in the fingers, the common ones are degenerative diseases, rheumatoid arthritis and so on. Morning stiffness is the symptom of stiffness and hardness in the joints of the hands for several hours after waking up in the morning in a stationary state. The main causes of morning stiffness are as follows: 1. Degenerative diseases: such as osteoarthritis, there will be swelling and pain in the finger area and the phenomenon of restricted movement. 2. Rheumatoid arthritis: when this kind of disease involves the finger, it may produce the phenomenon of morning stiffness, and the morning stiffness lasts for a long time. There may be other causes of morning stiffness, such as systemic lupus erythematosus, psoriatic arthritis, dermatomyositis, etc. When persistent morning stiffness occurs, it is recommended to consult the doctor in time, complete the relevant examinations, and carry out targeted treatment and therapy after the cause of the disease has been clarified.