The symptom of getting up in the morning with stiff ankles after a little activity may be a symptom of certain diseases, such as osteoarthritis and rheumatoid arthritis. 1. Osteoarthritis: due to obesity or long-term overuse of the ankle joint leading to ankle joint damage, can lead to osteoarthritis, morning stiffness symptoms, that is, after waking up or during the day for a period of time after the joints do not move there will be a sense of stiffness, after the activities of the joints after the pain is alleviated, but with the increase in activities and then appear pain. 2. Rheumatoid arthritis: it is an autoimmune inflammatory disease with chronic, symmetrical, multi-synovial arthritis and extra-articular lesions as the main clinical manifestations, and it can cause morning stiffness, i.e., the joints of the feet are painful after getting up in the morning, and the joints will be fine with a little bit of activity. This symptom alone is not enough to diagnose the disease, do not rule out that it is caused by other factors. It is recommended to go to the hospital as soon as possible for examination, and give targeted treatment after the doctor clarifies the cause of the disease.