There is no particularly clear statement on the performance of the elderly one month before death. Some elderly people may show pale face, weakness of limbs, depression, poor respiration, incontinence, drowsiness, loss of appetite, refusal to eat, etc., which are mostly related to the decline or even failure of multiple organ functions of the elderly, and ultimately lead to death. A part of the people can behave normally, without particularly obvious clinical manifestations, but mostly accompanied by certain chronic diseases, such as atrioventricular block, cerebral aneurysm, coronary artery atherosclerosis, etc., when the sudden rupture of cerebral aneurysm, myocardial infarction, atrioventricular block severe morbidity, can lead to sudden death, and daily life generally does not appear particularly obvious manifestations.