由于血液凝固性降低,或止血功能减退,或纤溶作用增强,血液从血管壁自行渗出;或在发生轻度外伤时(如拔牙),即出血不止,这些现象都叫做不正常出血;临床上可表现为皮下或粘膜出血(渗血)、瘀斑、紫癜等症状。不正常出血可伴发于多种疾病,如肝病、败血症,维生素K缺乏症等。凡是因血液凝固障碍或血小板异常引起的、以不正常出血为主要表现的疾病,叫做出血性疾病,如血小板减少性紫癜,血友病等。血液凝固障碍可因血液中某种或某些 Due to decreased blood coagulation, or hemostatic dysfunction, or increased fibrinolysis, blood leakage from the blood vessel wall; or in the case of mild trauma (such as tooth extraction), bleeding more than these phenomena are called abnormal bleeding; clinical On the performance of subcutaneous or mucosal bleeding (bleeding), ecchymosis, purpura and other symptoms. Abnormal bleeding can be associated with a variety of diseases, such as liver disease, sepsis, vitamin K deficiency and so on. All due to blood coagulation disorders or abnormal platelets caused by abnormal bleeding as the main manifestation of the disease, called bleeding disorders, such as thrombocytopenic purpura, hemophilia. Blood clotting disorders can be due to some or some of the blood