Sudden pain in the foot that prevents walking: First, stop the activity immediately, avoid continuing to walk with weight, rest appropriately, elevate the affected limb using pillows, and use crutches to get down to the ground. Second, if there is local swelling and fever, you can apply ice packs promptly, 15-30 minutes/time, 3-4 times/day. Third, oral anti-inflammatory and analgesic drugs, mainly non-steroidal anti-inflammatory and analgesic drugs, such as diclofenac sodium, meloxicam, celecoxib, etoricoxib, etc. Fourth, if the pain cannot be relieved by the above 3 ways, to further rule out whether there is a combination of gouty arthritis, rheumatoid joint, osteoarthritis of the ankle joint, you can go to the hospital for further examination to clarify the diagnosis.