Current research has not found lymphoma to have a very clear genetic predisposition or familial clustering. This is entirely different from familial breast cancer and colon cancer. Although there are many causes of lymphoma, and it is likely related to certain bacterial and viral infections, the mechanism of tumor occurrence is very complex. Infection is only one of the external factors, and currently, there is no evidence that lymphoma has tendencies for contagion or outbreaks. Therefore, as a relative of a lymphoma patient, the risk of developing lymphoma is not significantly higher than that of the general population, so there is no need for excessive worry.