![]() Some heart conditions that can lead to low blood pressure include extremely low heart rate (bradycardia), heart valve problems, heart attack and heart failure. Mild dehydration can cause symptoms of orthostatic hypotension, such as weakness, dizziness and fatigue. Fever, vomiting, not drinking enough fluids, severe diarrhea and strenuous exercise with a lot of sweating can all lead to dehydration. Many conditions can cause orthostatic hypotension, including: Orthostatic hypotension occurs when something interrupts the body's process of dealing with the low blood pressure. These cells also narrow the blood vessels and increase blood pressure. This tells the heart to beat faster and pump more blood, which evens out blood pressure. The baroreceptors send signals to the brain. Usually, special cells (baroreceptors) near the heart and neck arteries sense this lower blood pressure. Blood pressure drops because there's less blood flowing back to the heart. ![]() When standing from a sitting or lying position, gravity causes blood to collect in the legs and belly. Tell your care provider if symptoms occur at times that could be dangerous, such as while driving. Keep a record of your symptoms, when they occurred, how long they lasted and what you were doing at the time. It requires seeing a provider right away. Losing consciousness, even for just a few seconds, is serious. It's important to see a health care provider for frequent symptoms of orthostatic hypotension. If these symptoms happen only occasionally, there's likely no cause for concern. Dizziness or lightheadedness can also result from standing after sitting for a long time. Occasional dizziness or lightheadedness can be minor - triggered by mild dehydration, low blood sugar or overheating. Lightheadedness or dizziness upon standing.Orthostatic hypotension signs and symptoms include: Symptoms usually last less than a few minutes. The most common symptom of orthostatic hypotension is lightheadedness or dizziness when standing after sitting or lying down.
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