Chronic blood diseases mainly include chronic anemia, chronic leukemia and chronic bleeding disorders. 1. Chronic anemia: it is not an independent disease, and a variety of diseases can cause this disease. For example, decreased erythropoiesis caused by nutritional deficiencies (e.g. iron deficiency, folic acid and vitamin B₁₂, etc.), increased destruction of erythrocytes caused by bone marrow suppression (bone marrow suppression caused by radiotherapy) and other factors can easily cause chronic anemia. 2. Chronic leukemia: including chronic myeloid leukemia and chronic lymphocytic leukemia. The progress of the disease is slow and the duration of the disease is long. Patients often show low immunity, easy to catch a cold, easy to fatigue, fatigue, night sweats, and so on. 3. Chronic bleeding disorders: they can be caused by allergic purpura, vitamin C deficiency, platelet abnormality, coagulation factor abnormality and other factors. Chronic blood diseases have a wide range, including inert lymphoma, such as follicular lymphoma, marginal zone lymphoma, etc., in addition to the above categories of diseases. It can be seen that there are many underlying diseases that cause chronic blood diseases, and standardized treatment should be carried out under the guidance of physicians to avoid delay.