True cause of death should be described in the column of death certificate, but the name of complications or symptoms are often given. The latter causes various troubles. The column of the ”category of death” shows the cause-effect relationship between extrinsic factors and death, clarify the responsibilities of the persons concerned and also determines payments from insurance. It often happens that doctors overlook the injury due to accidents or they misjudge injury death as death due to disease. Intracranial bleeding due to injury requires discrimination from the bleeding due to disease. Doctor must report the death of a person to police, by which autopsy or investigation may clarify the real cause of death. Thus, disadvantage of the deceased, family and doctor can be avoided, while the responsibility of the persons is properly determined.