Postural orthostatic tachycardia syndrome (POTS), also known as postural tachycardia syndrome, is one of the common disorders that has orthostatic intolerance as the primary symptom.

Orthostatic intolerance is a condition in which an excessively reduced volume of blood returns to the heart after a person stands up from a lying down position. This causes light-headedness or fainting.

Under normal circumstances, when you stand up from a sitting or lying position, gravitational force pulls some of your blood down to your belly area, hands and feet. This causes the blood vessels to quickly narrow, leading to a slight increase in the heart rate to maintain blood flow to the heart and brain. This way the blood pressure does not drop drastically

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