What Causes Sudden Drops in Blood Pressure?

A sudden drop in blood pressure is very dangerous and can cause other serious problems such as fainting, dizziness and even unexpected falls that result in injuries.There can be many causes of a sudden drop in blood pressure and all of them are equally concerning and should be addressed by a physician. If not treated, drops in blood pressure can result in death in some cases.


Sepsis is a condition that is caused when an infection invades the bloodstream and overwhelms the body’s system and organs. According to the American Heart Association, the bacteria from the infection produce toxins that affect the blood vessels and can result in a quick and profound drop in blood pressure. This can result in death if not quickly treated by a physician.

Orthostatic Hypotension

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Orthostatic hypotension occurs when a person’s blood pressure drops after standing up from a sitting or laying position. This condition can occur because of some medications used for Parkinson’s disease, heart conditions or diabetes. Dehydration and prolonged bed rest can also be a cause of this condition. Notifying your physician as soon as you are aware of this problem is necessary. Changing medications or treatment for the medical disorder can prevent the person from being seriously injured from a fall due to a fainting spell.

Neurally Mediated Hypotension

According to the American Heart Association, neurally mediated hypotension is caused when blood pressure drops after standing for long periods. This condition is mostly seen in young people and is caused when there is a miscommunication between the brain and the heart. This condition can cause dizziness, fainting and nausea. You should seek immediate treatment for this condition.

Allergic Reaction

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An allergic reaction or anaphylaxis shock can be a deadly condition. It is caused when someone has a dangerous reaction to drugs such as penicillin, X-ray dyes, foods (such as seafood) or even bee stings. The condition is marked by a rapid blood pressure drop as well as a swelling of the person’s airway. If the condition is not quickly treated, the airway can become blocked and result in suffocation.


Dehydration can be caused when you have not taken in enough fluid to replace what the body has lost. Dehydration can occur in people who have over exercised, been exposed to increased levels of heat, or have had severe vomiting and diarrhea. Dehydration can result in a sudden blood pressure drop because of the loss of amount of fluid or water that helps the body function properly. The condition can also cause dizziness and confusion in a person and should be quickly treated by a physician.