If a person often feel cold below the knee there are several factors, from the perspective of Chinese medicine cold below the knee belongs to the body weakness and cold, kidney deficiency, spleen deficiency and triggered by cold below the knee. From the perspective of Western medicine, cold below the knee is due to the following factors: 1. From the perspective of orthopedic surgery, common factors are lumbar disc herniation, lumbar disc bulge, sacroiliac arthritis, knee osteoarthritis, knee meniscus injury or synovitis, which can lead to blood flow or peripheral nerve disorders below the knee, resulting in cold below the knee. 2. In Western medicine, patients with renal insufficiency, such as those with high urea nitrogen and creatinine, may experience cold below the knee, which is caused by urinary system insufficiency. 3. Rheumatic diseases, such as rheumatoid arthritis and rheumatoid arthritis, may also cause cold below the knee.