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.
Mildly low blood pressure, or hypotension, may be a sign of good health and a decreased risk of heart disease, but in some people, hypotension can be a problem. At times, continually low blood pressure or a sudden drop in blood pressure can lead to worrisome symptoms and even serious health problems. Understanding Hypotension. A blood pressure reading contains two numbers: systolic pressure and diastolic pressure. Systolic pressure is the top or first number in your blood pressure reading, indicating the pressure within your arteries when your heart pumps out blood.