Benign tumors and malignant tumors are obviously different from each other, no matter from macroscopic to microscopic, from appearance to internal structure, from their clinical manifestations to the harm to human body. Based on professional knowledge, clinical experience and certain special examination methods, doctors can generally distinguish benign and malignant tumors correctly. Benign tumors: Generally, they grow slowly and can exist in the body for several years or decades, with swelling growth and clear boundaries. Most benign tumors have a layer of fibrous membrane, which can be easily removed by surgery and generally will not recur or metastasize after removal. There are also some benign tumors growing in important parts of the body, such as benign tumors of the brain, which can threaten human life if not treated in time. A few benign tumors can evolve into malignant under certain conditions, therefore, benign tumors should also be treated at the right time. Malignant tumors: Also known as cancer, commonly known as toxic tumors, most of them grow faster and the boundaries of tumors are not too clear. Malignant tumors located in superficial parts, infiltrative growth, often not easy to promote, if not timely treatment can occur metastasis. Malignant tumors are usually not wrapped with film outside, and malignant cells infiltrate and spread to the surrounding area, endangering people’s health and life. For malignant tumors, early detection, early diagnosis and early treatment are advocated.