Yang deficiency may lead to problems such as fear of cold, a pale tongue, and lumbar and knee tenderness (a feeling of soreness and weakness in the waist and knees). Yang deficiency is generally categorized into Heart Yang Deficiency, Spleen Yang Deficiency and Kidney Yang Deficiency, with different clinical problems associated with different types of deficiency. 1. Heart Yang Deficiency: often characterized by panic, easy sweating, mental fatigue, a tendency to lie down, tightness and pain in the chest, fear of cold, and low temperature of the limbs. 2. Spleen-Yang deficiency: There may be fear of cold, edema, pain in the abdomen, coldness, pain relieved by warm objects or covering with hands, hypersalivation, and low temperature of the limbs. 3. Kidney yang deficiency: dizziness and dizziness, pale or grayish-black face, soreness and pain in the waist and knees, fear of coldness in the whole body (the most obvious in the lower limbs), and so on. When the above symptoms appear, it is recommended to treat them under the guidance of a doctor in a timely manner.