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Standing up can cause a sudden loss of blood pressure in your brain. This is especially true if you have been sitting in such a way as to partially cut off the blood supply to your legs. The blood rushing back to the deprived area causes the drop in blood pressure.

If this happens often, you may be suffering from hypotension (low blood pressure) and might want to consult your doctor. Hypotension can lead to fainting episodes, among other problems.

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โˆ™ 14y ago
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โˆ™ 13y ago

Standing up quickly causes a drop in blood pressure, which results in a decrease in blood-flow to your brain. This temporary decrease in blood-flow causes you to feel light-headed for a few seconds.

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โˆ™ 14y ago

Dizziness is a symptom of many different body system conditions and mechanisms. One cause is disruption of the normal feedback to the brain about the body's position in space.

If the gel-like fluid in the semicircular canals (part of the inner ear) are moved too far or in opposing directions by spinning or other rapid changes in position, the "hairs" (cilia) inside the canals send signals to the brain that can confuse spacial orientation. The abnormal motion of the cilia, and other structures in the canals, send conflicting signals to the brain. This unconscious data, sometimes coupled with the information about spacial orientation that the brain is receiving simultaneously from the eyes, can lead to varying degrees of dizziness.

Dizziness can also be caused by changes in the central nervous system and altered states of mind by opioids or other drugs, alcohol, or chemicals. Similarly, vertigo (dizziness) can be caused by anxiety, pain, fear, migraines, dementia and mental confusion, strokes and damaging high blood pressure, concussions and more severe head injuries. Neuropathy (disorders of the nerves), such as that in complications of Diabetes can also create this effect.

Weakness from dehydration, electrolyte imbalance, low blood sugar, low blood pressure, common colds and flu can also cause dizziness.

Anything that creates low oxygenation of the brain (hypoxia) will also cause this symptom. That can range from blood loss and anemia to cardiac and pulmonary diseases. Some examples are: hardening of the arteries in the brain or vessels leading to the brain; clots or occlusions of those vessels; heart rates too fast or too slow; hyperventilation; heart failure or damage from heart attacks; the heart's electrical stimulation malfunctioning (e.g., heart block); pneumonia and bronchitis; Asthma; Allergies; excessive G-Force as experienced by pilots and astronauts; etc.

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โˆ™ 14y ago

The fluid in your brain starts spinning. You get dizzy when you get up too fast because when you are sitting down, all the the blood is in you arms and legs, but when you stand up really quick, all of the blood rushes to your head, therefore you either get a headache or get dizzy. Its basically the reaction to the speed of your blood movement.

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โˆ™ 8y ago

When you stand up usually your body adjusts your blood pressure so you don't get dizzy. Sometimes the adjustment doesn't happen fast enough. This is called orthostatic hypotension if it happens.
Occasional dizziness or lightheadedness may be relatively minor and the result of mild dehydration, low blood sugar, or too much time in the sun or a hot tub, for example.
Dizziness or lightheadedness may also happen when you stand after sitting for a long time, such as in a lecture, concert or church.
If these symptoms happen only occasionally, it's not cause for concern.

It's called orthostatic hypotension - your blood has collected in your lower areas and it takes a moment for your heart to pump extra blood to your head. Your blood pressure drops for a moment.

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โˆ™ 8y ago

When you stand up usually your body adjusts your blood pressure so you don't get dizzy. Sometimes the adjustment doesn't happen fast enough. This is called orthostatic hypotension if it happens.
Occasional dizziness or lightheadedness may be relatively minor and the result of mild dehydration, low blood sugar, or too much time in the sun or a hot tub, for example.
Dizziness or lightheadedness may also happen when you stand after sitting for a long time, such as in a lecture, concert or church.
If these symptoms happen only occasionally, it's not cause for concern.

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โˆ™ 8y ago

It's called orthostatic hypotension - your blood has collected in your lower areas and it takes a moment for your heart to pump extra blood to your head. Your blood pressure drops for a moment.

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โˆ™ 10y ago

The presure in the air is higher than is was at the level of height you were at before you got up, and depending on how fast you stand up the level of dizzyness may differ.

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Q: Why do we get dizzy when we stand up too fast?
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Related questions

Why do you feel dizzy and can't see when you get up too fast?

This can be caused by high blood pressure.


Why does your body shake after you get up too fast not Dizzy but shake?

The lack of blood flowing to your brain.


Is it normal to feel faint whenever you stand up?

It is quite common if you do stand up too fast but if you arent standing up fast it could be a number of things: - Low blood sugar level - Low blood pressure - Some heart problems - Pregnancy - Vertigo - Inner Ear problem - Drug use - Brain disorder - Anaemia Just to name a few. I wouldn't be too worried if you only feel dizzy for a quick second after standing up but if it is for quite some time and you find you are getting dizzy at other times I would recommend you see you G.P.


Why do you get dizzy spells when you stand up?

If you have been lying down for a while or slouching, blood will start to stay around your brain. When you stand up all the blood flows back into the circulatory system which causes the dizzy feeling you get.


What if blood pressure is too low?

Usually, you feel dizzy, light headed or you just faint. If it falls too low, you can have brain death and multiple organ failure (liver, kidney etc) but this will happen after you lose consciousness.


What could be wrong when you get up too fast and you get dizzy?

THE ANSWER:There IS no problem except for the fact that blood rushes out of your head so quickly that you get dizzy, and in fact may pass out.This happens because your brain needs blood or it will stop working.That's why if you lie down then get up too fast you get dizzy.That is ALSO why your eyes go 3/4ths blank after doing the same thing.Hope this answers your question,Kabob34


Why do you become dizzy after a massage?

The most common reason that some people get dizzy after a massage has to do with the transition from being relaxed and lying down and then change to a vertical position standing up too fast. If you ever laid out in the sun and then stood up too quickly that you experienced a slight dizzy feeling, then you have experienced the same thing. A good massage will relax you, and then if the massage therapist does not get you up slowly, you may experience dizziness of even fainting.