The first reason for dizziness when exercising is that the body sweats a lot during exercise, resulting in a decrease in the body’s blood volume, and it is not replenished in time. When the effective blood volume is reduced, it will cause insufficient blood supply to the brain and the patient can experience dizziness. Secondly, dizziness caused by exercise may be the result of hypoglycemic reaction after a lot of exercise without timely replenishment of food. Patients can experience dizziness, panic and weakness, and can be given oral sugar or drink sugar water. Third, dizziness caused by exercise can also be seen in patients with cardiac arrhythmias. As a result of strenuous exercise, an arrhythmia may occur, thus affecting the blood supply to the brain and causing dizziness. Fourth, it can also be considered if the patient has high blood pressure, and the strenuous exercise leads to an increase in blood pressure, thus causing dizziness.