Sudden fainting, pallor and sweating should be considered as a result of hypoglycemic attack, postural hypotension, acute myocardial infarction and other diseases. 1. Hypoglycemic attack: hypoglycemic attack when the body’s energy supply is insufficient, can cause sudden fainting, pale, sweating clinical manifestations, through active eating to raise blood sugar can be relieved, especially in the diabetes of the basic disease of the population, prone to hypoglycemic attack. 2. Postural hypotension: For example, if you suddenly change from squatting position to standing position, due to the drastic change of body position, which causes postural hypotension, resulting in insufficient blood supply to the brain, you can have sudden fainting, sweating, pallor and so on, which can be relieved by resting in bed. Those with underlying diseases need to be treated for the cause. Avoid behaviors that can cause dramatic fluctuations in blood pressure. 3. Acute myocardial infarction: if the patient suddenly myocardial ischemia, myocardial cell damage, cardiac function decline, which can lead to a reduction in the volume of blood discharged, thus causing insufficient cerebral perfusion, insufficient peripheral blood supply, there can be a sudden fainting, sweating, pallor and other manifestations, this time you need to immediately seek medical attention to restore the heart’s blood supply, myocardial reperfusion of the treatment. The causes of sudden fainting, pallor and sweating are very complex, and it is necessary to consult a doctor in a timely manner to improve the relevant examinations under the guidance of the doctor, to clarify the causes of the disease, so as to systematically treat the disease, to avoid delaying the condition.