If an elderly person experiences sudden fainting, the specific causes are as follows: First, if the elderly person has a past history of cerebrovascular disease, he or she should be highly suspicious of cerebrovascular accidents, such as ischemic stroke, hemorrhagic stroke, and transient cerebral blood supply insufficiency attack. Second, for older adults with a past history of coronary artery disease, if fainting occurs consider the presence of acute coronary syndromes, typical arrhythmias, and acute myocarditis. Then, for older adults with a past history of diabetes mellitus in the event of sudden fainting, consider hypoglycemic coma, diabetic ketoacidosis, hyperosmolar coma, and lactic acidosis. In addition, older adults may also faint if they experience aura of heat stroke in the presence of environmental factors such as high heat in the summer. Finally, fainting can also occur in cases of acute gas poisoning, drug poisoning, and food poisoning.