Diffuse large B-cell lymphoma develops relatively fast, usually after one month, obvious lymph node enlargement can be seen, but its development speed is also related to the tumor stage and the patient’s physical condition, so it is recommended to seek medical treatment in time. Diffuse large B-cell lymphoma is a highly aggressive tumor originated from lymphohematopoietic system, with faster development speed and higher malignant degree, usually the lymph nodes can be seen obviously enlarged after one month, and it will be developed into advanced stage in a relatively short period of time if it is not treated timely and effectively. The specific development speed of diffuse large B-cell lymphoma should be considered according to the comprehensive factors such as tumor stage and patient’s physical condition. Generally, it can be divided into four stages, with stage I being the early stage of development and stage IV being the advanced stage. The 5-year survival rate of low-risk early-stage patients is usually up to 70%, and the 5-year survival rate of high-risk advanced-stage patients is only 30%. Such patients may have clinical symptoms such as night sweats, fatigue, fever, etc. They can usually be treated with stem cell transplantation and radiotherapy, targeted therapy, etc. Usually, do not eat raw food and spicy stimulation, greasy and cold food, it is best to eat a light diet, mainly liquid food, and appropriate exercise to improve resistance.