There is no fixed numerical relationship between high or low blood pressure values and dizziness. Normally, the systolic range for adults in a quiet state is 90-139 mmHg and the diastolic range is 60-89 mmHg. Dizziness may occur when the high pressure exceeds 140 mmHg and the low pressure exceeds 90 mmHg, or when the high pressure is below 90 mmHg and the low pressure is below 60 mmHg. However, whether a patient will experience dizziness when abnormal blood pressure occurs is mainly related to physical fitness. If the patient’s own blood pressure is high or low, the threshold for the appearance of dizziness may be higher or lower. For example, a patient with long-term hypertension may not feel dizzy until his or her blood pressure is above 200/130 mmHg because the body has tolerated it. In patients with more sensitive bodies or in the early stages of hypertension, dizziness may occur when the blood pressure is above 140/90 mmHg. The same is true for dizziness caused by lower blood pressure, which is mainly related to the patient’s physical fitness and has no specific value. Blood pressure values can determine heart function and peripheral vascular resistance. Patients with hypertension and hypotension can experience dizziness symptoms, and it is recommended to improve relevant tests under the guidance of a doctor to clarify the triggering factors and treat them as early as possible.