There are many clinical causes of cold knees, and the common causes are as follows: 1, lower limb vascular diseases: for example, lower limb arteriosclerosis occlusive disease, lower limb thrombo-occlusive vasculitis and other diseases. 2, arthritic diseases: such as osteoarthritis of the knee, rheumatoid arthritis of the knee and other diseases, can also appear similar symptoms. 3, systemic diseases: such as diabetes, post-traumatic bleeding, hypothyroidism and other diseases. 4, environmental factors: patients in a cold, wet environment for a long time, the knee joint will appear cold. The phenomenon.