Blood pressure is the force of circulating blood on artery walls, typically expressed as systolic over diastolic pressure in millimeters of mercury. Systolic pressure reflects the force when the heart contracts, while diastolic reflects relaxation between beats. Normal adult values are usually below 120/80 mmHg; persistent elevations increase the risk of heart attack, stroke, kidney disease, and cognitive decline.

Research shows that blood pressure is influenced by genetics, age, body weight, salt intake, physical activity, alcohol, stress, and sleep quality. With age, arteries stiffen and systolic pressure often rises, even when diastolic pressure remains stable or falls. Central blood pressure near the heart may differ from arm measurements, and this difference can affect risk assessment. Newer devices and analytical methods are being studied to better capture central pressure and pulse wave characteristics.

Studies increasingly emphasize 24 hour patterns. Ambulatory monitoring reveals that blood pressure typically dips at night, and the absence of this dip is linked to higher cardiovascular risk. Morning surges and variability from beat to beat or day to day also carry prognostic value beyond average levels alone.

Lifestyle interventions such as weight loss, regular aerobic exercise, reduced sodium and increased potassium intake, moderated alcohol consumption, and smoking cessation can significantly lower blood pressure. Large trials show that lowering systolic pressure to around 120 mmHg in high risk individuals reduces major cardiovascular events, though intensive lowering may increase some side effects. Current research continues to refine optimal targets and to personalize treatment by combining clinic readings, home monitoring, and ambulatory data.