So far, there are no clear reports in the literature confirming the hereditary nature of non-Hodgkin’s lymphoma. The causes of non-Hodgkin’s lymphoma are more complex and include: 1) abnormal immune function; 2) viral infections: such as EBV; 3) bacterial infections: some patients with gastric mucosa-associated lymphoma are associated with Helicobacter pylori infection; 4) poor lifestyle: such as staying up late, mood swings (stress, rage, irritability); 5) others: such as increased application of chemicals and work environment with increased radiation exposure.