Hypertension, or high blood pressure, is defined as a systolic blood pressure of 140 mmHg or higher and/or a diastolic blood pressure of 90 mmHg or higher. Around 90% of hypertension cases are considered "essential" or "primary" hypertension, which likely has a genetic component. Risk factors for hypertension include obesity, physical inactivity, stress, excessive salt intake, alcohol consumption, and smoking. Left uncontrolled, hypertension can increase the risk of heart disease, stroke, kidney disease, and other health issues. Treatment involves lifestyle changes like losing weight, exercising, and reducing salt intake, as well as medication if needed.