Warmth in the hearts of the hands and feet may be a sign of yin deficiency, and cold knees are usually due to cold. The specific causes need to be combined with the patient’s other symptoms to decide. 1. Yin deficiency: Yin deficiency is prone to internal heat, manifested as hot hands and feet, patients are often accompanied by dry mouth, dizziness, tinnitus, yellow urine and other symptoms. Yin deficiency patients should not eat spicy things that hurt the yin, such as white wine, chili peppers, peppers, raw onions, garlic and so on. 2. Cold: this part of the cold is generally localized cold caused by the cold, may be cold weather, wearing thin resulting; some are caused by blowing air conditioning. The affected area should pay attention to keep warm and avoid getting cold again. Patients with warm hands and feet and cold knees should actively seek medical attention.