Excessive exercise dizziness and nausea may be caused by lack of oxygen to the brain, anemia, hypoglycemia and other reasons, which can be relieved by proper rest and medication. 1. Cerebral hypoxia: During exercise, blood will flow to the limbs, resulting in a decrease in blood supply to the brain, which can lead to hypoxia, excessive exercise may cause dizziness and nausea. You can walk slowly after exercise to promote blood reflux, take proper rest and hydrate properly to relieve symptoms. 2. Anemia: When suffering from anemia, the hemoglobin content in the body decreases, thus reducing the oxygen content in the body, and dizziness and nausea will easily occur after excessive exercise. Can be supplemented with vitamin B12, folic acid, iron, etc. under the guidance of a doctor. 3. Hypoglycemia: Exercise will consume a lot of energy, excessive exercise may cause hypoglycemic reaction, resulting in dizziness, nausea. You can replenish energy in time after exercise, drink water in moderation, and consume sugary foods to replenish sugar. If the symptoms of dizziness and nausea appear after excessive exercise and cannot be relieved or are accompanied by other symptoms, it is recommended to seek medical treatment in time, to be diagnosed by a professional doctor and given reasonable treatment.