Ankle neck generally refers to the ankle joint. Swelling of the ankle joint in the elderly may be caused by ankle sprains, venous thrombosis of the lower extremities, hypoproteinemia, and other causes such as fractures. 1. Ankle sprains: Ankle sprains may be caused by ankle pulling or tearing, which may lead to injuries to the joint capsule, ligaments and tendons. Patients will have joint swelling, pain, joint mobility disorders and other manifestations. If the elderly ankle sprain, it will be manifested as ankle swelling. 2. Lower extremity venous thrombosis: Lower extremity venous thrombosis is considered to be caused by venous wall damage, hypercoagulable state of blood and stagnant venous blood flow. Patients will have symptoms such as swelling of lower limbs and reddening of skin. If the lower limbs of the elderly have lower extremity venous thrombosis, there will be ankle swelling. 3. Hypoproteinemia: Hypoproteinemia may be caused by factors such as protein synthesis disorders, massive protein loss, and kidney disease. Patients will show swelling, emaciation, anemia, ascites, weakness and so on. Therefore, the elderly will have hypoproteinemia and may have symptoms of ankle swelling. 4. Other: Ankle swelling in the elderly may also be caused by fracture, cellulitis, gout and other diseases. It is recommended that elderly people with swollen ankles need to consult a doctor in time, and the doctor will choose the appropriate measures to treat the cause.