Describe the prevalence.
Hypertension affects between approximately one-third and one-half of adults in the US.
Primary hypertension: accounts for ∼ 90% of cases of hypertension in adults and prevalence is increasing in children and adolescents. 
Secondary hypertension: accounts for ∼ 10% of cases of hypertension in adults 
Prevalence increases with age: Approximately 65–75% of adults develop hypertension by 65–74 years of age. 
Rates are highest in African American individuals, followed by white individuals, and lowest in Asian American and Hispanic individuals. 
∼ 60–87% of overweight and ∼ 73–95% of obese patients are affected.