Dizziness after exercise may be caused by transient cerebral ischemia and hypoxia, low blood pressure, high blood pressure, low blood sugar and other reasons. 1. Transient cerebral ischemia and hypoxia: after exercise, the blood vessels in the body and limbs expand and circulate faster, resulting in a relative lack of blood flow in the brain, which causes transient dizziness that can be relieved after rest. 2. Low blood pressure: after strenuous exercise, a lot of sweating, reducing the amount of circulating blood, resulting in low blood pressure, reducing intracranial blood flow, causing dizziness, it is advisable to supplement water. 3. Hypertension: Exercise will lead to sympathetic excitement, vasoconstriction, accelerated heart rate, which in turn causes an increase in blood pressure, the symptoms can be relieved after rest. It is recommended to monitor blood pressure and check for primary hypertension. 4. Hypoglycemia: mostly occurs in fasting strenuous exercise, energy consumption, resulting in low blood glucose, eat sugar symptoms can be relieved, usually it is also advisable to regularly monitor blood glucose, moderate exercise. If there is dizziness after exercise, it is recommended to go to the hospital in time to avoid delays.