The difference between secondary hypertension and primary hypertension includes etiology, age of onset, and treatment. 1. Causes: The clinical causes of primary hypertension include increased sodium intake, genetic factors, irregular work and rest schedules, and excessive obesity. The common causes of secondary hypertension include renal vascular disease, renal disease, aortic constriction, endocrine diseases, etc. 2. Age of onset: patients with primary hypertension are usually middle-aged or elderly and older. Patients with secondary hypertension are usually middle-aged and young people, and their age is relatively small. 3. Treatment: Primary hypertension usually requires the use of anti-hypertensive drugs to control blood pressure. Secondary hypertension requires active treatment of the underlying disease causing the hypertension. If you are suffering from secondary hypertension or primary hypertension, you should go to a regular hospital in time to see a doctor, and give targeted treatment and therapy after clarifying the cause of the disease.