It is not a good phenomenon that the patient has not been cold, which mostly suggests that there may be defects in the immune system of human body exist, resulting in the invasion of virus and bacteria, which the human body cannot recognize effectively. In addition, it is not excluded that malignant tumors may appear to be replicated in large quantities because of the weakened immunity. clinically, it can be dealt with by the following methods: 1. it is necessary to carry out whole body examination, including blood examination, especially the examination of tumor markers. 2. it is necessary to carry out examination through imaging such as chest CT to exclude the most likely lung cancer, as well as other gastric tumors, like liver cancer, kidney diseases 3.Exercise to improve the immunity of human body, especially aerobic exercise for more than 45 minutes a day, is very beneficial to patients. 4.Drink more water, do not stay up late, avoid smoking and quit drinking, and develop good living habits.