Prospective registry and biorepository of consecutive patients who present to emergency departments in the Detroit Medical Center with (1) an established history of hypertension (HTN) or (2) elevated blood pressure with no history of HTN. Patients are surveyed using validated Survey instruments including the SF-12 Health Survey, Patient Activation Measure short form (PAM-13), Berlin Obstructive Sleep Apnea Scale, Social Support Questionnaire short form (SSQ-6), Perceived Stress Scale (PSS-14), MacArthur Scale of Subjective Social Status, Six-Item Cognitive Impairment Test (6-CIT), and Brief Coping Orientation to Problems Experienced (Brief COPE). Biological specimens are obtained from consenting individuals. Other collected data include patient demographics, vital signs, physical examination, basic medical history, medications, electrocardiography, x-ray, and lab results.