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Hypertension is diagnosed when systolic blood pressure exceeds 130 mmHg and diastolic pressure surpasses 80 mmHg on two separate occasions. Systolic pressure measures force while the heart beats, while diastolic pressure measures force between beats. These elevated readings indicate high blood pressure requiring medical attention and management.

Primary hypertension has no identifiable cause but is linked to risk factors like smoking, obesity, and family history. Secondary hypertension results from underlying conditions such as polycystic kidney disease or hyperthyroidism affecting organs or systems. Understanding this distinction helps guide treatment approaches and identify reversible causes.

Hypertension symptoms include blurry or double vision, nosebleeds, and palpitations. However, many people with hypertension experience no noticeable symptoms, earning it the nickname 'the silent killer.' Regular blood pressure monitoring is essential for early detection, especially during pre-procedural guidelines for assessing blood pressure.

Hypotension is identified when systolic blood pressure falls below 90 mmHg and diastolic pressure drops below 60 mmHg. This low blood pressure may lead to inadequate blood flow to organs, resulting in insufficient oxygen and nutrient delivery. Prompt recognition of these readings is critical for preventing complications.

Orthostatic hypotension occurs when blood pressure drops abruptly upon standing from a sitting or lying position. Postprandial hypotension involves a significant decrease following a meal, particularly in older adults. Neurally mediated hypotension results from prolonged standing, causing miscommunication between the heart and brain, leading to decreased blood pressure.

Common hypotension symptoms include dizziness, fatigue, increased sweating, and tachycardia (rapid heart rate). These symptoms arise because organs are not receiving sufficient oxygen and nutrients due to reduced blood flow. Recognizing these signs helps healthcare providers intervene promptly and prevent serious complications.

Accurate measurement is essential because diagnosis of both hypertension and hypotension depends on precise readings taken on separate occasions. Proper technique and special considerations while measuring blood pressure ensure reliable data for clinical decision-making. Errors during assessment can lead to misdiagnosis and inappropriate treatment.