Neuron Structure. Your brain is made of approximately 100 billion nerve cells, called neurons. Neurons have the amazing ability to gather and transmit electrochemical signals -- think of them like the gates and wires in a computer.
Most doctors will only consider chronically low blood pressure as dangerous if it causes noticeable signs and symptoms, such as: 1  Dizziness or lightheadedness. 2  Nausea. 3  Fainting (syncope)  Dehydration and unusual 1  thirst. Dehydration can sometimes cause blood pressure to drop.  Lack of 1  concentration. Blurred vision.  Cold, clammy, pale skin.
1 Low pressure alone, without symptoms or signs, usually is not unhealthy. 2  The symptoms of low blood pressure include lightheadedness, dizziness, and fainting. 3  These symptoms are most prominent when individuals go from the lying or sitting position to the standing position (orthostatic hypotension).