Dizziness is usually caused by high diastolic blood pressure and insufficient cerebral blood flow. Generally speaking, high pressure refers to systolic blood pressure and low pressure refers to diastolic blood pressure, and any one of the two reaches the diagnostic standard of hypertension can be diagnosed as hypertension. Hypertensive patients, especially those with high diastolic blood pressure, will suffer from ischemia and hypoxia of the corresponding target organs, such as cerebral ischemia and hypoxia, which may be accompanied by dizziness, headache, nausea and vomiting, blurred vision, black haze, and rotation, etc. Antihypertensive medications should be taken under the guidance of a professional physician for the control of blood pressure, such as nifedipine, captopril, irbesartan and furosemide, etc. If patients have sudden onset of severe headache, they will have to take antihypertensive medications. If the patient has sudden onset of severe dizziness and vertigo, it is important to note that it may be cerebrovascular disease or excessive lowering of blood pressure or upright hypotension. In addition, sometimes dizziness and other symptoms may be due to the adverse effects of antihypertensive drugs. Therefore, patients with high blood pressure and dizziness are advised to go to a regular hospital and consult a specialized physician.