Dizziness is like death or psychosis: it doesn't have a specific cause, it occurs when you don't have it together enough not to experience it.
A lot of breathing variations cause lightheadedness and dizziness. Sudden sprints, sudden deep inhale or hyperventilation, asphyxiation, even venous pressure drop when you stand up too quick.
It's rumored that being blonde can be a causitive factor.
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