The right foot is cold and the left foot is not cold. Common causes include improper warming measures, deep vein thrombosis of the lower extremities, and arteriosclerosis occlusion of the lower extremities. 1. Improper warming measures: when the right foot is exposed to cold air for a long time, it will lead to the emergence of right foot localized cold. If the left foot is kept warm properly, the right foot will be cool and the left foot will not be cool. 2. Deep vein thrombosis of the lower limbs: when deep vein thrombosis is formed in the right lower limb of the patient, the blood circulation of the right lower limb will be obstructed, and the obstruction of blood flow will lead to a decrease in the skin temperature of the right lower limb, and the patient’s right foot will be cool and the left foot will not be cool. 3. Lower extremity atherosclerosis occlusion: Lower extremity atherosclerosis occlusion will lead to atherosclerosis of the lower extremity arteries, which may cause symptoms such as coolness of the lower extremities, weakness, numbness and so on. In only the right side of the lower limb there is atherosclerosis occlusion, the patient will appear right foot cool left foot is not cool. Clinically, there are many reasons for the right foot to be cold and the left foot not to be cold, when this kind of situation occurs, the patient should consult in the regular hospital in time, and under the guidance of the professional doctor to clarify the cause of the disease and correct treatment.