After receiving the New Crown vaccine, tumor progression is generally not accelerated. However, when tumor patients are at an advanced stage, or lung cancer patients due to cachexia, they may experience worsening of their disease after receiving the New Crown vaccine. The full name of New Coronavirus Vaccine is an inactivated vaccine with high safety and low impact on human body. However, when patients have malignant tumor, it may cause the aggravation of systemic symptoms such as fever and malaise after vaccination with the new coronavirus vaccine due to the damage of their own immune system, which may also indirectly lead to the aggravation of the primary disease and increase the difficulty of treatment. Therefore, for patients suffering from tumors, before vaccination, a comprehensive consideration should be made on whether or not the New Crown vaccine can be administered after a clear recommendation from a professional physician, so as not to cause an aggravation of the condition. Currently, it is not recommended for patients with malignant tumors to receive the New Crown vaccination. However, when patients are benign tumors or groups whose malignant tumors have been cured by radical surgery, vaccination can be considered after consulting a professional physician and generally will not lead to tumor deterioration.