Edema after myocardial infarction is a more dangerous phenomenon. Localized edema can lead to tissue necrosis or functional damage in the edematous area, and large generalized edema or cerebral edema can be directly life-threatening. Myocardial infarction patients after the onset of cardiovascular function is easy to decline or blood circulation function damage caused by local edema. Localized edema will directly affect the organism, leading to symptoms such as motor impairment, pulmonary hemorrhage, and dyspnea. Prolonged fluid circulation disorders can also directly affect the body’s metabolism, leading to symptoms such as asphyxia and coma. Myocardial infarction is also prone to brain edema. Due to the fragility of brain tissue, after localized edema or brain tissue damage, it is easy to develop into irreversible necrosis of brain tissue, which leads to the death of the patient or central nervous system damage and other symptoms. Therefore, all kinds of edema after myocardial infarction will cause different degrees of serious damage to the organism, which is a more dangerous complication. Patients with myocardial infarction need to prevent edema in the course of subsequent treatment, and consult a doctor for review in a timely manner.