The cause of numbness and swelling of feet may be varicose veins of lower limbs, arthritis, heart and kidney diseases. 1. Varicose veins of the lower limbs: when varicose veins occur in the lower limbs, it will impede the return of blood to the lower limb veins, so that the lower limbs have too much venous blood stagnation in the low-hanging parts of the lower limbs, leading to excessive local pressure, resulting in lower limb tissue edema, swelling sensation. 2. Arthritis: When inflammation occurs in the joints of the feet, it can lead to local infiltration of inflammatory cells and inflammatory exudation between the tissues, which can lead to numbness of the feet and a sense of swelling. 3. Cardiac and renal diseases: for example, right heart failure, resulting in venous blood in the lower limbs can not return to the heart, so that it stagnates in the low-hanging parts of the local tissue fluid increases and tissue edema, there will be a sense of swelling. Or when nephritis occurs, resulting in a large loss of protein in the blood vessels, which promotes the entry of fluid into the tissue interstitial space, resulting in tissue edema, which leads to a feeling of swelling in the feet. When the lower limbs appear numbness and swelling, it should be taken seriously, and it is recommended to go to the regular hospital in time, to clarify the cause of the disease, and actively treat it. At the same time, attention should be paid to rest and foot warmth, so as not to aggravate the symptoms.