Yang deficiency generally have fear of cold, cold limbs, pale mouth without thirst and other manifestations, Yin deficiency generally have dry mouth and throat, two zygomatic flushing (face on both sides of the zygomatic bone part of the color flushed), five heart heat (two hands and two feet heart heat, and consciously heart and chest heat) and other manifestations. 1. Yang deficiency refers to the loss of yang qi in the human body, which is caused by the injury of yang by prolonged illness, further development of qi deficiency, and living in cold places for a long time, etc. Generally, there is coldness, coldness of limbs, light mouth without thirst, liking of hot drinks, clear and long urination, low urine and swelling, and thin stools, etc., and it can be treated with medicines such as Bao Yuan Tang, Pian Zi Lizhong Tang, and Right Angelica Pill. 2. Yin deficiency refers to the deficiency of yin fluid in human body, which is caused by the late stage of febrile illness, prolonged depletion of yin fluid by miscellaneous illnesses, and injury of yin by excessive fire evils, etc. Generally, there is emaciation, dry mouth and throat, flushing on the cheekbones, five heartburn, hot flashes and night sweating (abnormal sweating after going to sleep, and stopping of sweating after waking up), short and yellowish urination, and dryness of stools, etc. It can be treated with medicines such as Tianwang Xinxindan (Heavenly King’s Pills), Shashen Maitou Tang (Sha Shen Mai Dong Soup), and Zuo Gui Pill. If there are signs of Yang or Yin deficiency, they can be adjusted under the guidance of doctor’s diagnosis, do not take medication without authorization, and should also develop good living habits to improve the related symptoms.