There are many reasons that lead to dizziness and nausea after exercise, usually due to long-term lack of exercise, hypoglycemia, insufficient blood supply to the brain, and other factors. 1. Long-term lack of exercise: for long-term lack of physical activity of the population, if a sudden intense exercise, may not be too adaptive, after a large amount of oxygen consumption brain will be ischemic, hypoxia, causing dizziness, nausea, vomiting and other symptoms. 2. Hypoglycemia: Exercise will consume a lot of sugar and water, if the supplement is not timely, it will cause the blood sugar to drop, resulting in hypoglycemia, causing dizziness, nausea, vomiting and a series of uncomfortable phenomena. 3. Insufficient blood supply to the brain: sweat a lot after exercise, resulting in insufficient blood volume of blood circulation, leading to insufficient blood supply to the brain, will also appear dizziness, nausea, vomiting and other symptoms. 4. Other factors: as the body position changes significantly when the movement, may affect the vestibular function, can also cause dizziness after exercise, nausea, vomiting symptoms; itself higher blood pressure, or cervical spondylosis, after exercise may also appear dizziness, nausea, vomiting symptoms. Dizziness and nausea after exercise may also be due to other reasons, if the symptoms are serious or the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, and under the guidance of the doctor systematic treatment.