Severe hypertension refers to this grade three or higher. If the systolic blood pressure is greater than or equal to 180 mmHg and the diastolic blood pressure is greater than or equal to 110 mmHg, it belongs to grade three hypertension, which is also called severe hypertension. Long-term severe hypertension can cause cardiovascular and cerebrovascular diseases, and in serious cases, hypertensive encephalopathy and cerebral hemorrhage, so effective drugs must be applied to reduce blood pressure to within the normal range of long-term medication. If the blood pressure fluctuates in the middle, it needs to be adjusted under the guidance of the doctor, do not stop or change the medication without permission, so as not to cause a sharp rise in blood pressure and bring harm to the body. Patients with hypertension also need to combine a reasonable adjustment of diet structure, try not to eat animal offal, fatty meat, low-salt diet is the main, so as not to cause arteriosclerosis blood pressure increase.