There are many reasons for the coldness at the knees, and each person is different. The more common reasons are as follows: 1, local blood circulation disorder. Need to see if there is no arterial stenosis or embolism.2, lack of calcium, iron and other mineral elements as well as vitamins, etc., need to be actively supplemented.3, lack of exercise, due to the cold and dare not activity, will lead to local blood does not flow, resulting in local cold.4, not enough warmth, wearing less clothes, riding an electric car more, the knee is often stimulated by the cold wind.5, the lack of hot food as well as fresh vegetables, Fruits, etc. 6, cervical spondylosis, lumbar disc herniation can lead to nerve damage, causing local cold, cold, swelling sensation. 7, special physique, related to cold physique, to strengthen the warmth, appropriate physical exercise, more blood circulation of traditional Chinese medicine hot compresses, scalding, more mutton, seaweed, seaweed, oleander, cinnamon, and other spicy foods, to ensure that enough sleep.