Q. Why do people feel dizzy after standing up very quickly?

Doctor Answer is medically reviewed by SecondMedic medical review team.

Answered by Seconmedic Expert

 When you stand up quickly, the sudden change in blood pressure can cause a rush of blood to your head. This can overload the capillaries in your brain and make you feel dizzy.

Another common cause of dizziness is dehydration. When you're dehydrated, your blood becomes thicker and more sluggish. This increases the risk of developing blood clots, which can also lead to dizziness.

Finally, changes in posture can also lead to feelings of lightheadedness or dizziness. For example, if you've been sitting or lying down for a long time and then suddenly stand up, the sudden change in position can cause a drop in your blood pressure and make you feel lightheaded or dizzy.

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