Hypotension implies an abnormally low level of blood pressure. This is more of a physiological state than a disease. Many a times shock leads to hypotension though shock is not necessarily indicative of hypotension. Hypotension can be fatal and is generally understood to be the opposite of hypertension which refers to abnormally high levels of blood pressure. A huge network of nerves, receptors, hormones which constitute the autonomic nervous system help to constantly regulate the blood pressure. The sympathetic nervous system tends to heighten the blood pressure while the parasympathetic nervous system does just the opposite. The rapid balancing helps the human body to maintain a certain accepted blood pressure over a wide range of normal activities and in many disease states.