Cold feet in summer may be a physiological phenomenon due to low air conditioning temperature, but also due to varicose veins of the lower extremities, diabetic foot and other diseases. 1. Physiological phenomenon: summer weather is hot, some patients may like to set the air conditioner to a lower temperature in order to cool down. When the temperature of the air conditioner is lower, the indoor temperature will drop, and the blood circulation in the patient’s body will be slowed down after the temperature drops, so the phenomenon of cold feet occurs in summer. 2. Pathological factors: (1) Varicose veins of the lower limbs: After varicose veins of the lower limbs, the blood circulation of the lower limbs of the patients will be blocked, resulting in poor blood circulation in the lower limbs. As a result, the peripheral circulation becomes poor, and then there will be the symptom of cold feet in summer. (2) Diabetic foot: diabetes is a serious condition that is prone to narrowing or occlusion of the blood vessels of the lower extremities, resulting in a decrease in peripheral blood circulation, and thus diabetic foot occurs. Patients usually show symptoms such as cold feet, coldness and numbness. It leads to cold feet in summer. To summarize, the causes of cold feet in summer are different, it is recommended that patients go to the hospital in time for examination, to clarify the specific causes of the disease and then follow the doctor’s instructions for treatment.