MID affects approximately 4 out of 10,000 people. It is estimated that 10 - 20% of all
dementias are caused by strokes, making MID the third most common cause of dementia in the elderly, behind Alzheimer's disease and DLBD (dementia of Lewy bodies). MID affects men more often than women. The disorder usually affects people over 55, with the average onset at age 65. The symptoms of MID vary. Memory loss is often an early symptom of the disorder, followed by trouble making judgments. This often progresses to delirium, hallucinations, and thinking problems. Personality and mood changes can also occur. Lack of emotion and motivation, withdrawal, and extreme excitedness (agitation) are common. Confusion that occurs or is worse at night is another common symptom. Risk factors for MID include a history of stroke, hypertension, smoking, and atherosclerosis. Some research suggests that MID may cause Alzheimer's disease or make it get worse faster. MID may be misdiagnosed as Alzheimer's, or may be found in addition to Alzheimer's disease.
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