The causes of left leg coldness and chills may be frozen left leg, osteoarthritis, narrowing of the artery in the left leg, peripheral neuritis and so on. 1. Frozen left leg: when the weather is cold, it can cause blood circulation to slow down, making the left leg feel cold and chilly, which is a physiological phenomenon, no need to worry too much, and can be relieved after taking warm measures. 2. Osteoarthropathy: It is a kind of joint disease that mainly damages the articular cartilage and involves the whole joint tissues, which is the most common joint disease, preferred in the elderly. The disease occurs in the left leg, which can lead to edema and fluid accumulation in the joint, increased sensitivity to temperature, and a cold and chilly feeling in the left leg. 3. Arterial stenosis of the left leg: arterial stenosis of the left leg can lead to a decrease in blood supply to the left leg, making the leg feel cold and chilly. The common cause is the formation of atherosclerosis under the action of high blood lipids, high blood pressure, high blood sugar and other triggering factors, which in turn leads to arterial stenosis. 4. Peripheral neuritis: it may be caused by bacterial infection, heavy metal poisoning, nutritional disorders, etc., which can lead to local warmth and tactile sensation disorders and make the surface of the skin appear hot or cold. Other clinical manifestations include weakened muscle movement at the ends of the limbs, pain and numbness. There are many other causes of coldness and chills in the left leg, and it is recommended to consult a doctor in time to clarify the cause of the disease.