The swelling at the ankle may be related to the following reasons: 1) there may be trauma here, such as a sprain of the ankle joint, there will soon be obvious swelling around the ankle joint, and it is progressively aggravated; 2) it may be due to old injuries, such as old fractures, dislocations or sprains in the past, after recovery, there may be more or less local swelling. If the patient has to stand for a long time due to work, the swelling will be obvious after a day of work. This is due to poor blood flow due to prolonged standing, resulting in excessive fluid accumulation in the joint. 4. In this case, the joint space may be full or the joint may be diffusely swollen. 5. This condition may also be caused by a series of medical diseases, such as heart, kidney, endocrine, blood and other related diseases that can cause the above symptoms.