Blood-borne diseases are diseases that can be transmitted from person to person through blood. In clinical practice, blood-borne diseases are usually viral infections, such as hepatitis C, hepatitis B, syphilis, AIDS, etc. These diseases can be transmitted from person to person through blood, so these diseases are also one of the key screening targets during clinical blood transfusions and other examinations. Hepatitis C is mainly transmitted through blood and is seen clinically in many patients with long-term blood transfusions, such as hemophilia A and hemophilia B. Patients with long-term blood transfusions have a significantly higher chance of contracting blood-borne diseases, and many hemophiliacs tend to have hepatitis C. In addition, when clinical control is poor, it is also easy to cause the spread of blood-borne diseases, such as HIV transmission, hepatitis C transmission, etc., resulting in major medical errors. Therefore, hematology specialties are commonly seen in hepatitis B, hepatitis C, syphilis, and AIDS.