Why do I get dizzy when I stand up? this is actually a question not free points

It's perfectly normal and nothing to worry about.

Explanation:

Orthostatic hypotension — also called postural hypotension — is a form of low blood pressure that happens when you stand up from sitting or lying down. Orthostatic hypotension can make you feel dizzy or lightheaded, and maybe even cause you to faint.

i also get dizzy when i stand up but i only get dizzy when i sit down for a very long time then get up but

Explanation: Orthostatic hypotension — also called postural hypotension — is a form of low blood pressure that happens when you stand up from sitting or lying down. Orthostatic hypotension can make you feel dizzy or lightheaded, and maybe even cause you to faint.