White-coat hypertension is a familiar term to most clinicians. Patients with white-coat typically have elevated blood pressure measurements in the clinician’s office, but display normal BP measurements in their everyday environment. The prevalence of white-coat hypertension varies from 15% to 20% of patients. Conversely, there is another group of individuals whose hypertension often goes unnoticed by traditional methods of BP measurement. These patients have normal in-office BP but elevated out-of-office BP. This phenomenon is referred to as “masked hypertension” and is defined as having in-office BP < 140/90 mm Hg but daytime ambulatory or home BP ≥ 135/85 mmHg.