When people mention tumors, they will start to worry and fear the harmful effects of the disease, but in fact, there are two kinds of tumors: benign and malignant. If the tumor is benign, there is no need to worry too much, because psychological factors can also affect the aggravation of the disease, while malignant tumors need to go to hospital for long-term treatment. How to distinguish benign and malignant tumors. The difference between benign and malignant tumors is based on the following three points: a. With or without envelope Benign tumors: slow growth rate, sometimes can stop growing, so there is little change in five or ten years, tumor cells are swelling growth, often have envelope formation, so they are clearly demarcated from surrounding normal tissues, no adhesion, packet fast soft, large mobility, rarely bleeding and necrosis. Malignant tumor: fast growth, mostly invasive and exophytic growth, often without envelope formation, and unclearly demarcated with surrounding tissues, mostly unable to push, often necrosis, bleeding or ulcer formation. Benign tumor: good differentiation, small heterogeneity, tumor cells are similar to the surrounding normal tissues and rarely have nuclear division. Malignant tumor: the degree of differentiation is not good, the heterogeneity is large, the tumor cells are different from the surrounding normal tissue cells, and the phenomenon of pathological cell nuclear division can be seen. Benign tumor: no metastasis, less recurrence after treatment, less harmful to human body, mainly the effect of local pressure and obstruction of tumor. Malignant tumor: metastasis can occur and often recur after treatment. The harm to the body is not only the adverse consequences brought by compression and obstruction, but also can destroy tissues causing bleeding and infection causing cachexia. However, intracranial malignant tumors only invade to the adjacent parts or metastasize within the central nervous system, and rarely metastasize to other parts of the body. For patients, to know accurately whether the tumor they have is benign or malignant, whether it is cancer or sarcoma among malignant tumors, the answer can only be obtained from the formal pathological examination in hospital. Note: Some benign tumors may also have complications such as bleeding, obstruction of passage (e.g. esophageal smooth muscle grows into the lumen of esophagus and increases to cause narrowing of official cavity, resulting in symptoms such as poor feeding and choking), damage to organ function (e.g. intracranial benign tumors may cause elevated cranial pressure due to compression and obstruction), plus a few benign tumors can develop into malignant tumors, at which time, tumor growth is accelerated. Doctors suggest that any type of tumor should be treated early and timely, and one should not think that benign tumor can be safe and sound, because benign tumor can also develop into malignant tumor.