The presence of bacteria in the bloodstream can lead to the formation of bacteremia, sepsis, and septicemia. 1. Bacteremia: Bacteria can cause bacteremia if they enter the circulation through the infected lesion. However, it should be noted that bacteremia means that only a small amount of bacteria enters into the blood circulation without abnormal reproduction or only a small amount of reproduction, which usually only causes a mild inflammatory reaction. 2. Sepsis: If a large number of bacteria and the toxins produced by the bacteria enter the blood circulation continuously, and a large number of bacteria multiply in the blood circulation, causing systemic inflammation, it means that the patient is suffering from sepsis, and death will be caused if the patient is not treated in time. But sepsis may also be caused by other pathogens, such as viruses, parasites and so on. 3. Sepsis: Sepsis is caused by pathogenic bacteria entering the blood circulation and multiplying in the blood. It can involve all parts of the body. Bacteria do not exist in the blood of healthy people, and their presence will lead to great potential harm to the individual. It is important to prevent and control this condition on a daily basis and to seek medical attention when it occurs.