Acquired hemophilia A (AHA) is a rare autoimmune disease characterized by an unjustified prolonged activated partial thromboplastin time (aPTT) and abnormal acute bleeding symptoms with no personal or family history of coagulopathy—due to the production of inhibitor of coagulation factor VIII (FVIII)—with a normal prothrombin time (PT) [1]. Here, F8 is linked to autoimmune disease.