How long can lung cancer live with conservative treatment is mainly based on the patient’s anatomical classification and cytological classification to make a comprehensive judgment. If it is central type lung squamous carcinoma, generally it cannot be treated by surgery and given radiotherapy, chemotherapy or immunotherapy, etc., the patient’s survival period is mostly about 1-3 years. If it is central type lung adenocarcinoma and the gene targeting drug is positive for gene mutation, gene targeting drug treatment can be chosen and the survival period can be more than 1 year or even 2 years or longer. If it is peripheral squamous carcinoma, it can be given surgical resection treatment with adjuvant chemotherapy after surgery and the survival may be about 3-5 years or more than 5 years. If treated conservatively, the natural course of the cancer is about 1 year. If it is peripheral adenocarcinoma with positive gene mutation, giving surgical treatment and postoperative adjuvant chemotherapy and targeted drug treatment can significantly prolong the survival period, 2-3 years or even more than 8 years in some cases, which is still only about 1 year if treated conservatively. In conclusion, the survival period of lung cancer with conservative treatment is usually within 1 year, and if it is accompanied by severe pain, inability to eat, long-term bed rest, or even brain metastasis, the survival period is significantly shortened, sometimes 3 months or 6 months.