What cause diziness?

Depends: Three categories: vertigo - sense that you or world is spinning - cause- inner ear or brain dysfunction syncope / presyncope - sense of going to pass out often accompanied by visual loss, sweating, stomach upset, weak knees. Cause- low blood flow to the brain not vertigo and not syncope - cause - hundreds of unrelated causes - sleep deprivation, intoxication, electrolyte disturbance, anxiety...