Hemophilia B is a congenital, inherited disorder of blood clotting. It is explained below in terms of concepts, symptoms and treatments. 1. Hemophilia B is also known as plasminogen activator component deficiency. Hemophilia B is mainly related to heredity and gene mutation, etc. It may also be related to autoimmune diseases, the use of certain drugs such as penicillin, malignant tumors and surgery. 2. The main symptom of hemophilia B is that weight-bearing joints, soft tissues and mucous membranes of the body will have excessive bleeding or spontaneous bleeding after injury. 3. Hemophilia B generally cannot be cured, but the patient’s bleeding can be controlled by plasma transfusion or cold precipitation. In addition, patients should pay more attention to protect themselves in daily life, avoiding accidental injuries, weight-bearing and over-exertion, so as to reduce spontaneous bleeding of the body. In addition, they should also exercise and pay attention to their diet, and take more high-protein foods such as eggs, milk and lean animal meat to enhance their resistance and immunity. Specific diagnosis and treatment should be carried out under the guidance of physicians.