The place with the fewest blood vessels in your whole body is your knee.  With cooler, or colder temperatures, it is easy for your knee to get cold, as the reduced temperatures impede blood flow. The reduced blood flow can easily lead to an insufficient oxygen supply, and this hypoxic state can cause knee pain. The pain can be prevented if the knee is kept warm and good blood flow into this area is maintained.  Moxibustion can help keep the knee warm and maintain the needed blood flow. Traditional Chinese medicine says: “If the heat does not enter, the cold will not come out.” During moxibustion, the heat energy transmission and penetration through the skin meridians can dispel this cold.  Many people try to alleviate knee pain by taking medications.  However, with few blood vessels and reduced blood flow, it is difficult to transport the medications to the painful areas within the knee.