Most fainting in hypotensive patients is due to cerebrovascular hypoperfusion caused by hypotension, resulting in the occurrence of dizziness, headache, blackouts, and syncope. Hypotension includes acute hypotension and chronic hypotension. For acute hypotension, symptoms often occur, and acute hypotension is commonly associated with acute blood pressure reduction caused by hemorrhage, infection, shock, allergy, and other factors. In addition, for coronary artery disease, acute coronary syndrome, especially patients with myocardial infarction can present with cardiogenic shock and hypotension. Hypotension often causes hypoperfusion conditions in target organs, such as heart, brain, kidney, fundus, and extremities, and the corresponding symptoms occur. Cerebrovascular hypoperfusion often results in dizziness, headache, blackness, syncope, and other related symptoms.