Common causes of dizziness and nausea after exercise include insufficient blood supply, low blood sugar, high blood pressure and lack of physical exercise. 1. Insufficient blood supply: sweating a lot after exercise may lead to a decrease in the effective circulating blood volume of the body, thus leading to insufficient blood supply to the brain and dizziness and nausea. 2. Low blood sugar: After a lot of exercise, blood sugar may be too low, and low blood sugar may lead to dizziness, nausea, sweating, and general weakness. 3. High blood pressure: After exercise, due to the needs of the body, it will lead to accelerated blood volume and accelerated heart rate, resulting in increased blood pressure, which will lead to dizziness and nausea. 4. Lack of physical exercise: long-term lack of exercise, if the amount of exercise is too large, the body’s burden is too heavy, may appear dizziness and nausea. Dizziness and nausea after exercise, need to consult the doctor in time, under the guidance of the doctor for reasonable disposal and treatment.