Hypotension or low blood pressure occurs when systolic pressure is below 90, and diastolic pressure is below 60. Low blood pressure indicates inadequate blood flow to the vital organs, including the heart and brain. For healthy people, low blood pressure is typically short-lived and does not lead to long-term issues. Causes of low blood pressure include loss of blood, low body temperature, sepsis, heart disease, medication, dehydration, and allergic reactions.
When a person feels dizzy or lightheaded after standing quickly, they have experienced a sudden drop in blood pressure. Low blood pressure indicates insufficient oxygen flow to the vital organs. When the brain has reduced oxygen, it cannot function properly and orthostatic hypotension or postural hypotension results. Orthostatic hypotension is a form of low blood pressure that develops when you stand up from sitting or lying down. If lightheadedness persists or happens regularly, the individual should see a doctor.
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