Low Blood Pressure
As blood circulates through the body, it pushes against the arteries with every heartbeat. The force of blood pushing against artery walls is called blood pressure. Hypotension is when the blood pressure is too low. Unlike hypertension, hypotension is not a disease, but rather a symptom. It can be a sign of neurological disorders, dehydration or a side effect of a drug treatment.
The manifestations of hypotension are not always of the same intensity and can be experienced very differently by different people. Some people suffer from it on a daily basis, while others, with identical blood pressure values, are hardly bothered at all and can live with it without any problems.
What Is Low Blood Pressure?
Hypotension is defined by an abnormal decrease in the pressure of blood, which means that it is too low in the blood vessels. As a result, blood flow to some of the vital organs, such as the brain and lungs, may be restricted.
The normal value of blood pressure is considered to be 120/80, 120 mmHg for systolic pressure (the pressure that occurs during a heartbeat, when the heart contracts) and 80 mmHg for diastolic pressure (the pressure between two heartbeats, when the heart relaxes).
Low blood pressure is a reading of less than 90/60mmHg. A sudden fall in blood pressure can be dangerous. A change of just 20 mm Hg — a drop from 110 mm Hg systolic to 90 mm Hg systolic, for example — can cause dizziness and fainting.