The present invention relates to a method of managing a history of the injection of a medicinal fluid. More particularly, the present invention relates to a method of managing a history of the injection of a medicinal fluid, which is capable of managing the history of the injection of a medicinal fluid in an apparatus for injecting a medicinal fluid that automatically injects a predetermined volume of medicinal fluid into a vein or epidural space of a patient in order to manage the pain of the patient.