Four times of chemotherapy is generally considered to be the most likely cause of cancer, but it may also be some immuno-rheumatic diseases or kidney diseases, such as systemic lupus erythematosus, nephrotic syndrome, etc. Chemotherapy is one of the important clinical treatments for cancer. Chemotherapy is one of the most important clinical treatments for cancer. Chemotherapy can effectively inhibit the growth and proliferation of cancer cells and kill the actively growing cancer cells, so as to control the development of cancer and prevent its recurrence and metastasis. However, chemotherapy must be applied to confirmed cancer patients, and cannot be used on suspected cancer patients who have not yet been diagnosed. In addition to being mainly used for cancer treatment, chemotherapy drugs, as a kind of immunosuppressant, can also be applied to diseases caused by abnormalities in the body’s immune system, such as lupus erythematosus, nephrotic syndrome, and so on. As the treatment alone cannot confirm the diagnosis of the disease, it is recommended that the patient improve the examination to clarify the cause of the disease and then actively treat the disease to avoid delaying the condition.