Why Do You Get Dizzy When You Stand Up Too Fast?

By Vanshika Gaur
24 Jul 2025, 16:30 IST

Many times, we feel dizzy or lightheaded when we stand too quickly. This happens due to numerous reasons such as sleep deprivation, dehydration, orthostatic hypertension, and more. Tap to know more!

Orthostatic Hypotension

When we stand up too fast, the blood pools in our legs, leading to sudden drop in blood pressure and reduced blood flow to the brain, causing dizziness.

Sleep Deprivation

People who are sleep deprived may feel dizzy or lightheaded, as lack of sleep affects blood pressure, brain function, and body’s ability to adjust to sudden movements.

Anaemia

Individuals experiencing anaemia have few red blood cells, making it difficult for the body to deliver enough oxygen to the brain and leading to dizziness.

Dehydration

Dehydration can also cause dizziness or lightheadedness, as low water intake reduces blood volume, making it harder for the heart to pump enough blood to the brain.

Electrolyte Imbalance

When the minerals like sodium, potassium, and magnesium levels drop, it affects blood pressure and muscle function, leading to dizziness.

Information Credits

According to PubMed, we feel dizzy when we stand up too fast due to orthostatic hypotension, sleep deprivation, and more. It is advisable to consult a healthcare professional for personalised suggestions.