Cold and sore knees may be caused by poor local blood circulation, chronic inflammation and meniscus ligament tissue damage. 1. Poor blood circulation: the blood supply to the knee area is relatively small, especially after getting cold, the local blood vessels will contract, further reducing the blood supply to the local tissues, and the symptoms of cold and sore knees may occur. 2. Chronic inflammation: When degenerative arthritis occurs, chronic inflammation may occur in the connective tissues of the knee, resulting in chronic inflammatory changes such as stiffness and hyperplasia of the local tissues, which may cause cold and soreness in the knee. 3. Meniscus ligament tissue injury: when the meniscus and ligament tissue in the knee are injured, it will lead to congestion and edema in the knee, and synovitis may also occur, which will also lead to cold and sore knees. When the symptoms of cold and sore knees appear, you need to avoid excessive stress on the knees, usually pay attention to the warmth of the knee area, and the symptoms continue to be unrelieved, you should consult a doctor in time to clarify the cause of the disease, and then targeted treatment to completely improve the symptoms.