Lymphoma has a genetic link. Generally speaking, lymphoma patients with first-degree immediate relatives in the family have a risk of developing lymphoma two to three times higher than that of the normal population, but will not develop into cancer through direct heredity. Lymphoma is a malignant tumor originating from the lymphohematopoietic system, and is mostly associated with exposure to chemicals, such as long-term exposure to pesticides and hair dyes, which are prone to cause lymphoma. Autoimmune diseases such as AIDS, rheumatoid arthritis, and long-term irregular diet are all prone to cause lymphoma. Lymphoma often takes painless swelling of superficial lymph nodes as the first symptom, and it occurs in the neck, groin and other parts of the body. Some patients do not have obvious swelling of superficial lymph nodes and develop generalized hypermetabolic symptoms, such as fever, emaciation, night sweating and fatigue. Therefore, people with family history should pay more attention to prevention, understand the cause of the disease, and achieve early detection and early treatment.