The neck of the foot generally refers to the ankle joint, and swelling of the neck of the foot is commonly caused by prolonged standing, prolonged squatting, etc. maintaining the same posture for a long time, or the female physiological cycle, pregnancy, etc. Physiological swelling of the neck of the foot can occur. Of course, it may also be due to pathological reasons, commonly trauma, gout, heart disease, kidney failure, etc. 1, trauma: the most common cause is trauma, such as foot sprain during exercise, resulting in swelling and pain on the outside of the ankle joint, it is recommended to go to the hospital for an X-ray examination to check whether there is a fracture. If there is no fracture, ligament injury is most likely to be considered. In the acute phase of the injury, ice and braking are needed to allow the ligament to repair itself. If the acute period is not treated, the pain will slowly ease after some time, but poor ligament repair, later may appear repeated sprains; 2, gout: another more common cause is gout, there are some young people or middle-aged people, after eating hot pot, eating seafood, drinking beer, suddenly appear red, swollen, painful ankle joint. Especially at night, for unknown reasons, the redness and swelling suddenly starts, the pain is very intense, and there will be depressed edema under pressure, and this condition is mostly considered to be caused by gout. When this happens, it is recommended to seek medical attention and have uric acid checked. If the uric acid is too high, it can be diagnosed as caused by gout. During the acute period, you can use some pain relief drugs; after the acute period, it is recommended to use drugs to lower uric acid as prescribed by the doctor to control uric acid to normal level. In order to avoid the high level of uric acid in the blood, which may cause acute attacks of gout or affect kidney function or other organs, causing adverse effects on the body; 3. Heart disease: If the swelling of the ankle joint is bilaterally symmetrical, consider that it may be caused by heart disease. If the edema of the ankle joint or even both lower limbs is caused by heart failure in the elderly, you can use drugs that nourish the heart muscle, improve the contractility of the heart muscle and strengthen the heart and diuretic to treat the edema of the ankle joint or both lower limbs caused by heart failure, such as furosemide, digoxin and hydrochlorothiazide. 4. Renal failure: Impaired kidney function and the inability to discharge water from the body can also cause edema of the ankle joint or even both lower limbs. For this situation, it is recommended to seek medical advice in time and give oral medication or dialysis treatment etc. under the guidance of doctors; 5. Other: local inflammation, varicose veins in lower limbs, deep vein thrombosis in lower limbs, tumors in lower limbs compressing veins, lymphatic system diseases in lower limbs, rheumatoid arthritis and other diseases may lead to impaired blood flow in lower limbs and slow lymphatic return, causing symptoms of swollen feet and neck. After the cause is clearly identified, the symptoms can be relieved by local cold compresses, elevation of the lower limbs, medication, surgery and other means as prescribed by the doctor.