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Hypotension is a condition in which the blood pressure is lower than normal. Some people naturally have low blood pressure and they can function normally but in others there is usually something else causing it.

Common causes of hypotension are:
shock
stress or trauma
standing up suddenly
allergic reaction to drugs
anaphylaxis (a life-threatening allergic response)
dehydration

The blood pressure is normally above 90/60 mmHg. When the blood pressure is too low there is inadequate blood flow to the heart, brain and other vital organs. Borderline low blood pressure for one person may be normal for another. The most important factor is how the blood pressure changes from the baseline or normal condition. A fall of 30 mmHg or more from a person's baseline is considered low blood pressure. Sometimes hypotension can be manifested in fainting spells and temporary loss of consciousness.

It is important to contact your GP if there is any sudden drop in blood pressure. In emergencies the condition will be stabilized first. Then, a history will be obtained and a physical examination performed. Frequent monitoring of vital signs (temperature, pulse, rate of breathing, blood pressure) will be necessary.