Feeling cold in the thighs, there may be problems with the blood vessels of the lower extremities, especially the arteries of the lower extremities. It is recommended to consider an ultrasound of the blood vessels of the lower extremities first. If there is arterial stenosis, interventional treatment may be considered. Coldness in the lower extremities may be caused by poor blood circulation, such as when venous return is obstructed or lymphatic return is obstructed, the temperature of the lower extremities will also decrease. In another case, if the patient belongs to the Yang deficiency constitution, even if there is no organic lesion, the cold sensation in the thighs may occur, and the symptoms may be relieved by applying drugs to improve blood circulation or by giving drugs such as kidney tonics.