Malignant tumors always come unknowingly and unscrupulously attack the healthy bodies of our friends and relatives, and now malignant tumors have become the number one killer threatening human health. It is necessary to prevent cancer scientifically and effectively through reasonable diet and physical exercise, but it is also a good thing to increase some professional knowledge about tumor to help ourselves and our family. There is no absolute boundary between benign tumor and malignant tumor, and some tumors are called junctional tumors. For example, ovarian junctional plasmacytoid cystadenoma and mucinous cystadenoma. Even malignant tumors vary in their degree of malignancy. Some benign tumors can undergo malignant changes, and individual malignant tumors can stop growing or even subside. For example, polypoid adenoma of the colon can turn into adenocarcinoma, and individual malignant tumors such as malignant melanoma can stop growing or even completely disappear due to the enhancement of the body’s immunity. For example, neuroblastoma cells in children and adolescents can sometimes develop into mature nerve cells, and sometimes even metastatic cells can also develop and mature, so that the tumor stops growing and heals itself. However, this is very rare. The following are the eight differentiations between benign and malignant tumors: The difference between benign and malignant tumors: the biological characteristics of benign and malignant tumors are obviously different, and thus the effects on the body are also different. The difference between benign and malignant tumors is of great significance for the diagnosis and treatment of tumors. 1.Degree of tissue differentiation: benign tumors have good differentiation, small heterogeneity and similar morphology with original tissues; malignant tumors have bad differentiation, large heterogeneity and big difference with original tissues. 2.Nuclear splitting image: benign tumor nuclear splitting image is absent or rare, and pathological nuclear splitting image is not seen; malignant tumor nuclear splitting image is common and pathological nuclear splitting image is seen. 3.Growth speed: benign tumor is slow; malignant tumor is fast. 4.Growth mode: benign tumors are often seen as swelling and exophytic growth, the former often has envelope formation, and the surrounding tissues are usually clearly demarcated, so it can usually be pushed; malignant tumors are infiltrative and exophytic growth, the former has no envelope formation, and the surrounding tissues are usually not clearly demarcated, so it usually cannot be pushed, the latter is accompanied by infiltrative growth. 5.Secondary changes: necrosis and bleeding rarely occur in benign tumors; necrosis, bleeding and ulcer formation often occur in malignant tumors. 6.Metastasis: benign tumors do not metastasize; malignant tumors often have metastasis. 7.Recurrence: benign tumors rarely recur after surgery; malignant tumors often recur after surgery and other treatments. 8.Impact on organism: benign tumor is small, mainly causes local compression or obstruction, if it occurs in important organs, it can also cause serious consequences; malignant tumor is large, in addition to compression and obstruction, it can also destroy tissues at the origin and metastasis, cause necrosis and bleeding combined with infection, and even cause cachexia.