Patients with advanced lymphoma are not contagious because lymphoma is also a lymphoma, which is not an infectious disease. Whether in the early, middle or late stages of lymphoma, it is not contagious from person to person, so advanced lymphoma is not contagious. The causes of lymphoma are still not very clear, but a lot of clinical studies have found that biological factors are very important in the occurrence of lymphoma, especially viral infections, such as EBV and human T-lymphocyte virus, which can cause the occurrence of lymphoma. Besides viral infections, physical and chemical factors also have very important significance in the occurrence of lymphoma, for example, people who are exposed to x-rays and radionuclides for a long time, or people who are exposed to toxic gases such as paint, benzene and formaldehyde for a long time are also prone to lymphoma. Therefore, lymphoma is not an infectious disease, and it is not contagious in the late stage of lymphoma.