There are many reasons for dizziness, nausea and vomiting after exercise, generally due to hypoglycemia, insufficient blood supply to the brain, long-term lack of exercise and other factors. 1, hypoglycemia: exercise will consume a lot of sugar and water, if the supplement is not timely, it will cause a drop in blood sugar, resulting in hypoglycemia, causing dizziness, nausea, vomiting and a series of discomfort; 2, insufficient blood supply to the brain: a lot of sweating after exercise, resulting in blood circulation of blood volume, resulting in insufficient blood supply to the brain, will also appear dizziness, nausea, want to vomit and other symptoms; 3, long-term lack of exercise: for long-term lack of physical exercise, if the sudden strenuous exercise, may not be very adaptable, a large number of oxygen consumption after the brain will be ischemic, hypoxic, causing dizziness, nausea, want to vomit and other symptoms; 4, other: when doing physical position obvious exercise, may affect the vestibular function, also can cause dizziness, nausea, vomiting symptoms after exercise; people with high blood pressure, or those with cervical spondylosis, may also experience dizziness, nausea, vomiting symptoms after exercise. Therefore, when doing daily exercise, the amount of exercise should be gradually increased, usually after exercise to pay attention to rest and relaxation, appropriate replenishment of sugar, electrolytes, water, and reduce the amount of exercise as much as possible when the body does not feel well. When the symptoms of dizziness, nausea and vomiting cannot be relieved for a long time, you should immediately go to the hospital to find out the cause of the disease so as not to delay the condition.