The most common causes of swollen feet and neck are poor posture, heart failure, acute injury, kidney disease and so on. 1. Poor posture: If the patient maintains a standing position for a long time, it is easy to cause poor blood circulation in the lower limbs, and swelling will form in the neck of the feet. Usually, the symptoms can be relieved by adequate rest and proper elevation of the lower limbs when lying on the back. 2. Heart failure: if the patient has heart failure, the patient’s cardiac output decreases, the peripheral circulatory resistance increases, and the return blood volume decreases, it is easy to induce edema of the lower extremities. 3. Acute injury: if the patient’s neck is traumatized or acutely sprained, the local inflammatory reaction will easily cause local swelling. 4. Kidney disease: if the patient has chronic nephritis and glomerulonephritis and other kidney diseases, it may cause the kidney’s urinary capacity to decline and then appear swollen neck. Swelling of the neck is caused by a variety of reasons, may also be related to lower extremity venous thrombosis, varicose veins and other reasons, if the symptoms continue to be unrelieved, it is recommended to go to the hospital in a timely manner to find out the cause of the disease, the doctor targeted treatment.