The knee feels cold and swish considering physiological factors and disease factors such as knee osteoarthritis, synovitis caused by the exclusion of physiological factors, should consult a doctor in a timely manner. 1. Physiological factors: If the patient has been in a cold and damp environment for a long time, or wearing too few clothes in the rain or cold weather, the knee may feel cold and swishy, away from the cold and damp environment, and take measures to keep warm, the symptoms can be relieved. 2. Knee arthritis: knee joints due to inflammation, trauma and other factors lead to lesions, the blood supply of blood vessels in the knee joint area is reduced, the skin temperature of the knee area will be reduced, thus appearing the knees feel cool. Drugs or surgery are needed depending on the severity of the symptoms. 3. Knee synovitis: can be caused by trauma, infection and other factors, the patient may appear knee joint swelling, pain, knee feeling cool and so on. The patient can follow the doctor’s instructions for medication and physical therapy. There may be many other reasons why the knee feels cold and swishy, it is recommended to exclude physical causes and timely consultation and targeted treatment.