oxygen <\/a>to function optimally, and when its deprived of oxygen, it may result in fainting spells or blackouts. <\/span><\/p>\n\n\n\nSome patients state that they feel tired and need to sit down. As they change level and relax, they may pass out suddenly. These fainting spells typically last anywhere from a few seconds to a few minutes depending on the severity of oxygen starvation that the brain experiences.<\/span><\/p>\n\n\n\nHowever, people about to experience a mini-stroke can [pass out on their feet as well, making it a dangerous situation where they can knock their head against surfaces, or crack their skull on the floor due to a hard impact. <\/span><\/p>\n\n\n\nIf you notice that you are suddenly developing symptoms of \u201cwhite out,\u201d where you feel slightly nauseous before blacking out, then speak to your doctor immediately, as it could be a warning sign of an impending mini-stroke.<\/span><\/wp-block><\/p>\n\n\n\n\n\n\n\n