what  cause swollen ankles
Arthritis, or joint inflammation, can cause localized swelling in the foot or ankle. Osteoarthritis is a common form of arthritis that may cause occasional swelling, usually in a single joint. Gout is another form of arthritis that typically causes a very painful, red, swollen big toe joint. Gout can also affect the ankle. Some autoimmune diseases cause swelling and arthritis that affect both feet equally, such as rheumatoid arthritis, psoriatic arthritis, lupus, and reactive arthritis (Reiter's syndrome).
Medical conditions known to cause swelling that affects both legs equally include heart disease, kidney disease, liver disease, and chronic sleep apnea, and complications of diabetes. Premenstrual syndrome (PMS) is also a well-known cause of swelling in the ankles and feet.