Cold legs and leg coldness is a deficiency of yang qi, of which there may be a deficiency of heart yang, spleen yang, or kidney yang (lack of yang qi in the kidneys), which needs to be judged according to the symptoms of the whole body. If it is a deficiency of heart yang, it manifests itself in symptoms such as heart panic, heart and chest suffocation, pain, shortness of breath, and excessive sweating. Heart-Yang deficiency manifests as panic, tightness in the heart and chest, pain, shortness of breath, excessive sweating, easy exertion, fatigue (mental exhaustion, physical weakness), and fear of cold limbs. Spleen-Yang deficiency is characterized by reduced diet, abdominal distension, abdominal pain, preference for warmth, fear of cold limbs, lack of warmth in the limbs, loose stools, or even stools containing undigested food, swelling of the limbs, short urine, and in women, a high amount of thin and sparse leucorrhoea. Kidney yang insufficiency has dizziness, waist and knee pain, cold limbs, cold limbs, lower limbs, mental depression, loss of libido, impotence and premature ejaculation, women’s uterine cold and infertility, or diarrhea, urination, long and long times, and so on. Symptoms need to go to the hospital in a timely manner, individuals should not choose their own diagnosis and medication.