Dizziness is a frequent problem for diabetic patients and may be associated with all systems and organs of the body, especially with brain function. Normal brain function depends on proper cerebral blood flow and the level of oxygen and glucose in the blood, and to maintain normal brain function activity, it depends mainly on normal blood glucose supply. Therefore, diabetic patients who experience persistent, severe dizziness must not be underestimated and should be alerted to its possible dangers. Possibility 1: Hypoglycemia Symptoms such as dizziness and weakness can occur in diabetic patients with high or low blood sugar, but the danger of hypoglycemia is more obvious, and its degree of danger depends on the degree of decline in blood sugar value, the speed of decline and the duration of hypoglycemia. Therefore, in the process of diabetes treatment, especially patients who apply insulin should be especially vigilant, and once dizziness occurs, more attention must be paid to monitoring blood sugar to prevent hypoglycemia from occurring. Possibility 2: Rapid rise of blood glucose Infection, trauma, diarrhea, vomiting, or eating a lot of sweets or stopping medication automatically can cause a sudden rise of blood glucose in a short period of time in diabetic patients. If the rate of increase is too fast, it may lead to dizziness and even life-threatening. Possibility 3: Combined hypertension Patients with diabetes who have combined hypertension usually develop the disease quickly and have serious consequences. The most common manifestation of hypertension is dizziness. Therefore, once dizziness is detected and the two conditions mentioned above are ruled out, it is important to test the blood pressure to see if it is normal. In the case of diabetic patients who are already known to have combined hypertension, consideration should be given to whether the dose of antihypertensive medication used is too high, causing the blood pressure to drop too low. Possibility 4: Cerebrovascular lesions Pay attention to the presence of cerebrovascular lesions, such as cerebral infarction, coronary artery disease, heart rhythm disorders and cerebral arteriosclerosis. If these diseases are present, the patient may experience dizziness due to insufficient blood flow to the brain and oxygen glucose in the blood. Patients with diabetes combined with hypertension should especially pay attention to the occurrence of cerebrovascular pathology, and once persistent dizziness occurs, it is best to go for electrocardiogram and cranial CT for timely treatment.