Some people who complain of dizziness feel like they are going to faint. This problem is usually due to a lack of blood flow to the brain. The most common cause is "orthostatic hypotension," in which blood pressure drops when someone stands up from a bed or chair (see also Fainting). Near-fainting spells can also be caused by the straining associated with coughing or going to the bathroom. An older person who gets up to urinate in the middle of the night, who strains to have a bowel movement, or who has a respiratory problem may experience near fainting, or even fainting. Probably the most serious causes of near-fainting spells are heart problems, including narrowed heart valves and problems with heart rhythm.
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