![]() 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.
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