Are tumors caused by inborn genetic predisposition, or are they caused by acquired living habits and environment? Are tumors hereditary? And which tumors are closely related to genetic factors? This may be the tumor patients and their families are very concerned about the problem! So, are tumors hereditary or not? After a lot of medical practice, it is found that genetic factors do play a certain role in the pathogenesis of tumors, such as children’s retinoblastoma, which is most closely related to genetic factors. Generally speaking, tumors related to genetic factors can be divided into two kinds, one is hereditary tumors, such as children’s nephroblastoma, retinoblastoma are hereditary tumors, and people with abnormal tumor genes tend to develop them. The other is a clear genetic predisposition of the tumor, often caused by hereditary developmental disorders, such as familial ring colon polyps are prone to colon cancer, hereditary immunodeficiency syndrome is prone to develop lymphoreticular system tumors. In addition, the tumors inherited from “cancer quality” also have obvious family heritability, but no exact genetic factors and cancer-causing genes have been found. For example, the first-degree family members of patients with gastric cancer will have a risk of gastric cancer about three times higher than that of the general population, and there is also a certain relationship between breast cancer, hepatocellular carcinoma, esophageal cancer and colorectal cancer and heredity. The most common recognition of the family heritability of some tumors is due to chromosomal aberrations. Simply speaking, there are 46 chromosomes in each cell of the normal human body, and carcinogenic factors will make the chromosomes change in number and morphology, resulting in chromosome aberrations. The aberrant chromosomes may be passed on to the offspring, thus making the offspring have the possibility of developing cancer, but not necessarily getting cancer. The occurrence of cancer is determined by internal and external factors, cancer body is only some kind of internal cause of cancer, in addition, external cancer-causing factors also play a big role, such as radiation, smoking, drinking, bad dietary habits of the family. So people with family history of cancer don’t have to be too panic. So it is true that there is a certain relationship between tumors and hereditary factors. After learning which tumors are hereditary and how hereditary is generated, what do people with family history of cancer need to do? First of all, they should avoid unnecessary panic and realize that hereditary qualities may not necessarily lead to cancer. On the other hand, they should undergo relevant checkups as early as possible to strengthen the awareness of cancer prevention, so as to achieve early prevention, early detection and early treatment. In addition, judging the patient’s constitution and susceptible organs according to the five movements and six qi so as to correct the constitution and protect the susceptible organs can also be of great help to the prevention of tumors.