Malignant tumors are cancers. There are two main categories of tumors, benign and malignant. Malignant tumors are themselves cancer, they are just called by different names. Some of the benign tumors may turn into cancer. Tumors are mainly proliferations due to inflammatory stimuli, or genetic mutations, etc. And according to their nature, they have different effects on their organisms, and are divided into benign and malignant tumors. Benign tumors are not cancerous and can usually be treated by surgical resection, which has good therapeutic effect and is not easy to recur, but may evolve into cancer if not treated in time. On the other hand, malignant tumors can be infiltrated and metastasized, thus threatening the patient’s life, with poor therapeutic effect and easy to recur. If the malignant tumor is of epithelial origin, it is called cancer, and if the malignant tumor is of mesenchymal tissue origin, it is called sarcoma. Tumor does not necessarily mean cancer, but also includes benign tumor lesions, and malignant tumors also include sarcoma and other lesions, it is recommended that those who have concerns in this regard must seek medical attention in a timely manner to clarify the nature of the disease, so as to carry out targeted treatment.