Whether lymph node swelling for two years is cancer or not cannot be generalized, and there is no certain relationship between lymph node cancer and the length of lymph node swelling. Lymph node cancer may be caused by metastasis of other cancer cells, which will usually continue to increase in size. If the lymph nodes are enlarged within two years without other symptoms, it is considered to be inflammatory hyperplasia. There are many causes of enlarged lymph nodes, such as bacterial infection, malignant tumors and various injuries inside and outside the body, etc. It is not necessarily cancer, and further examination is needed to clarify the cause. Lymphoma is a type of cancer originating from the immune system, which usually manifests itself as swollen lymph nodes, itchy skin, loss of appetite, coughing, and difficulty in breathing, etc. Lymph nodes can be surgically removed for pathologic examination. Treatment to help minimize damage and complications, which mainly includes radiation and chemotherapy, can slow down the progression of the disease and control the cancer cells. After diagnosis of enlarged lymph nodes, it is necessary to carry out treatment as early as possible, choose appropriate treatment plan according to the actual situation, to prevent the possibility of cancer, maintain a good state of mind, eat a balanced diet, and carry out exercise appropriately to enhance resistance, which can improve the situation of enlarged lymph nodes.