Is getting dizzy after you suddenly stand up or do any sudden movemonts good? I've been reading stuff about brain cancer and the fact that some of the symptoms include dizzyness. I got really scared. And it just so happens that most of the times when I do any sudden movements like (been sitting down using a PC and all of the sudden I need to stand up but then get dizzy) type of sudden movemonts. Is getting dizzy for that kind of reason normal especially because of the fact that I am 6'2"-3"?

I went to the doctor to check it out but he said it was normal since I am big and he kind of said that it takes time for blood to get to the heart.

Can somebody take away my fear? Please?

Summarized question: Is getting dizzy after you suddenly stand up or do any sudden movements dangerous?