Low Blood Pressure Symptoms When blood pressure is not sufficient to deliver enough blood to organs, the organs do not work properly and may be permanently damaged. For example, if insufficient blood flow to the brain, brain cells do not receive enough oxygen and nutrients, and one can feel a light head, dizziness, or even fainting. Going from a sitting or lying to standing position often causes the symptoms of low blood pressure . This occurs because standing causes blood to "put" in the veins of the lower body, and this can lower blood pressure. If blood pressure is already low, standing can make blood pressure worse, to the point of causing symptoms. Development of a light head, dizziness, or fainting upon standing caused by low blood pressure is called orthostatic hypotension. Individuals are normally able to quickly compensate for the low pressure created by standing with the responses discussed previously and do not develop orthostatic hypotension. When there is...