Almost every time I stand up or move too quickly I get dizzy, and experience a head rush. This has only begun recently in the past month, but I’m a little worried. Does anyone know why? I think I’ve been drinking enough water, so are there any other options of why this is happening? I am a teenager (if that’s important)

UPDATE: so the spells have been constant, but overwhelming. I did some research, and I think the most likely answer is iron levels, meaning I may have anemia (I think that’s what it’s called). I want to say thanks for everything and your advice. I probably would have shrugged it off if no one had said anything.