A high pressure of 160 mmHg and a low pressure of 90 mmHg is considered secondary hypertension. The criteria for normal blood pressure in normal adults are systolic blood pressure below 120 mmHg and diastolic blood pressure below 90 mmHg, systolic blood pressure greater than or equal to 140 mmHg, and or diastolic blood pressure greater than or equal to 90 mmHg, locating hypertension. Hypertension is classified into three levels: Grade 1 hypertension refers to systolic blood pressure between 140-159 mmHg and diastolic blood pressure between 90-99 mmHg; Grade 2 hypertension refers to systolic blood pressure between 160-179 mmHg and diastolic blood pressure between 100-110 mmHg; and Grade 3 hypertension refers to systolic blood pressure greater than or equal to 180 mmHg and or diastolic blood pressure greater than or equal to 110 mmHg. The blood pressure of 160/90mmHg belongs to secondary hypertension, and it is recommended to add antihypertensive drugs on the basis of improving lifestyle. In the case of middle-aged or older patients, calcium antagonists such as amlodipine and nifedipine are recommended as the first choice. An antihypertensive drug with unsatisfactory blood pressure control can be added with enalapril. If enalapril cough is not tolerated, you can switch to irbesartan.