Hypertension (HTN), also known as high blood pressure, is the persistent and chronic elevation of blood pressure in the arteries that can cause problems health and damage to body organs. There are two main types of hypertension: primary (essential) and secondary (Khan, et al., 2013). Primary hypertension is a progressive increase in blood pressure with no known cause or contributing underlying disease. Secondary hypertension is an acute onset or increase in blood pressure associated with an underlying factor, such as: illness, medications, pain, and/or disease process. There are approximately 200 different diseases and conditions that contribute to or cause secondary hypertension. The most common chronic diseases that cause secondary hypertension include OSA, diabetes, chronic liver disease, congenital heart disease, and thyroid or parathyroid disease (Chobanian, et al., 2003). Diagnosis of hypertension Measurement of systolic and diastolic blood pressure is carried out using a sphygmomanometer and a stethoscope. Blood pressure measurement/diagnosis is carried out in a doctor's office or clinic; it is repeated over time to ensure accuracy, and the measurement is quick and painless. Systolic pressure is the blood pressure in the arteries during the contraction phase of the heart. Diastolic pressure is the pressure in the arteries during the relaxation phase of the heart. Currently, JNC 7 (2003) has classified blood pressure into categories based on systolic and diastolic blood pressures for diagnostic purposes, based on evidence associated with cardiovascular disease. The JNC 7 (2003) systolic/diastolic blood pressure classifications are divided according to the following diagnoses:• normal...... middle of paper ...... use,• stress,• sedentary lifestyle, and• obesity (Pedrosa, Krieger, Lorenzi-Filho and Drager, 2011). The different categories of hypertension linked to OSA are as follows: • nocturnal hypertension (abnormal blood pressure over 24 hours which includes elevated blood pressure during sleep with non-falling and/or inverted immersion), • resistant hypertension (blood pressure uncontrolled hypertensive blood pressure despite the use of three antihypertensive medications, including a diuretic), • masked hypertension (normal blood pressure in a clinic or doctor's office and which becomes hypertensive while ambulating, or in the family environment.), and • pulmonary hypertension (high blood pressure in the pulmonary arteries, distinct from systemic hypertension) (Zhang & Si, 2012). Currently, PAP therapy is not mentioned, nor considered as a treatment measure for hypertension..