Dizziness after running is considered to be related to physiological factors or some diseases such as hypoglycemia, anemia, high blood pressure and heart disease. 1. Physiological factors: when the running time is too long, the temperature of the running environment is high, or when you exercise strenuously, your body sweats more, and the blood volume in your body decreases, which leads to short-term insufficient blood supply to the brain and may result in the symptom of dizziness. In addition, poor physical condition, lack of sleep and other physiological factors can also cause dizziness when running. 2. Hypoglycemia: Running on an empty stomach leads to excessive consumption of sugar in the body, and if it is not replenished in time, there may be a drop in blood sugar causing dizziness. Some patients may suffer from weakness, sweating, palpitation, pallor, shortness of breath and other symptoms. 3. Anemia: It is mainly related to the reduction of red blood cells, excessive destruction of red blood cells, blood loss and other factors. When anemic people run, dizziness can occur, and some patients also have headache, tinnitus, poor concentration, memory loss, palpitations after activities and other uncomfortable symptoms. 4. High blood pressure: Strenuous running in a short time will cause heart rate to increase, cardiac output to increase, causing blood pressure to rise. Elevated blood pressure can cause dizziness, headache, nausea and vomiting and other symptoms. 5. Heart disease: If some people suffer from certain heart diseases such as congenital heart disease or arrhythmia, etc., and due to running causes the heart to eject less blood, thus inducing the symptoms of dizziness, which can also be accompanied by palpitations, shortness of breath and other phenomena. There are many reasons that cause dizziness after running, and it is recommended that those who have dizziness after running should consult a doctor in time for examination, clarification of the cause of the disease and timely treatment.