To evaluate whether chemotherapy is good or bad, we need to consider various factors, such as the pathology of the tumor, the clinical stage of the tumor, the physical condition of the patient, etc. However, we should grasp the most fundamental principle, if the benefit of the patient is greater than the toxicity and side effects of chemotherapy on the body, chemotherapy is good, and vice versa, chemotherapy is not good. For patients with indications for chemotherapy, chemotherapy is beneficial if it can reduce tumor size, improve clinical symptoms, improve quality of life and prolong survival time. On the contrary, for patients with contraindications to chemotherapy, chemotherapy will aggravate their condition, and even lead to death in serious cases, so chemotherapy is naturally bad.