What causes hypotension?

Many. Anemia, low heart rate, fast heart rate, adrenal disease, bleeding, valvular disease, medications - these are the main causes.
Several things. Lack of blood (bleeding), lack of fluid (dehydration), dilated blood vessels, (drugs, toxins, venom, poisons, sepsis, and certain nervous system disorders) or poor pumping (for example, a heart attack).

Related Questions

What causes hypotension and what are the symptoms? Do you just faint?

Hypotension. There are many causes of hypotension from dehydration to bleeding or an overwhelming infection or sepsis. Often people with significant hypotension can pass out so the first treatment is to lay the patient flat in order to keep the blood going to the brain. Also patients are given lots of fluids to expand the volume. Read more...

What causes hypotension during exercise or during exposure to heat? Not dehydration, thyroid, cardiac, pulmonary, or endocrine. BP normal otherwise.

That may be normal. Do you just want to know such phenomenon or do you personally experience symptoms such as dizziness at fast standing-up during exercise? Both exercise and heat exposure normally dilate all blood vessels so to lower blood pressure, but usually autonomic nerve system can automatically regulate the degree of vessel dilation so to maintain circulation to the brain adequately. But, few cannot do so... Read more...
Vasodilation. Hypotension is by definition low BP and while BP may be normal you may experience lower BP relative to your normal when your vessels dilate in response to a rise in internal temperature. Cardiopulmonary, endocrine, anemia, dehydration and infection are potential causes, as are medication side effects. Note that you can be volume depleted -- with these symptoms -- and not technically dehydrated. . Read more...

What would cause postural hypotension triggered by heat in healthy 15 yr old girl. Not dehydrated, good diet, slim, exercise reg. Deficiency? Vitamin?

Orthostatic. Postural hypotension occurs when something interrupts the body's natural process of counteracting low blood pressure. Occasional dizziness or lightheadedness may be relatively minor — mild dehydration, low blood sugar, or too much time in the sun or a hot tub. It may also happen when you stand after sitting for a long time, (class, concert, church). If only occasional, not cause for concern. Read more...

What is the cause of hypotension?

Many causes. Hypotension can be caused by many causes - sometimes it is normal, other times by medications or metaboloic conditions such as low thyroid. Hypotension causing shock can be hypovolemic (from loss of blood), cardiogenic (heart function not working well), obstructive (pulmonary embolism causing blood vessel obstruction), or distriubutive (think sepsis, low adrenal function, anaphyaxis, toxins). Read more...

What is the cause of hypotension in surgery?

Several things. Lots of things can cause low blood pressure. If it is related to surgery, the first thing i would consider would be bleeding (bad to miss and easy to correct). The anesthetic agents themselves can lower blood pressure. If the patietn had a heart attack during surgery the blood pressure could be low. So the anesthesiologist must figure out which problem it is, as the treatment depends on the cause. Read more...
Hypotension. Surgical hypotension may be from fluid or blood loss, anesthetic effect on vasculature, or from obstruction of venous return. Other less common causes also exist............ Read more...