The concept of “evil and positive deficiency” is a pathogenetic concept without definite symptoms, which is manifested by the disappearance of the damaging effect of the evil qi on the organism, and the depletion of the positive qi to be restored. Evil to Zhengxu refers to the disease process, the positive qi to resist the evil qi, the evil qi retreat and the positive qi is greatly injured in the pathogenesis of the change. Mostly because of the exuberance of the evil, Zhengqi depletion is more serious; or Zhengqi vegetarian deficiency, sense of evil after the serious injury to Zhengqi; or attacking the evil fierce, Zhengqi great injury to. At this time, the disease mechanism is characterized by the evil has retreated, the damage to the body has disappeared, but the positive energy is consumed by the situation has yet to be restored. Evil to the positive deficiency is mostly seen in the recovery period of serious diseases, if properly regulated, generally tends to improve, healed. Take the recovery period of lung carbuncle as an example, if the evil is removed, there may be fever gradually subsiding, coughing reducing, coughing and vomiting pus and blood less and less, odor also reducing, sputum becoming clear and thin, but it is difficult to lie down for a long time, shortness of breath and fatigue, self-sweating (involuntary sweating during the daytime, sweating aggravated by the slightest movement), color of the face is not gorgeous, and fatigue (lack of mental strength), etc. If there is any symptom, it is necessary to take professional medical advice to help the patient to recover from the disease. If you have symptoms, you should take medication under the guidance of a medical professional, do not take medication blindly on your own to avoid delays or adverse reactions.