Sudden confusion: Or inexplicable changes in personality, aggression or an inability to concentrate.
What it might be: Worst-case scenario—a brain tumor or bleeding in the brain. Stroke is another possibility, especially if confusion is combined with numbness or weakness in the face, hands or legs and slurred speech. If so, immediate medical attention is essential to reduce the chance of irreversible brain damage. Other possibilities include reactions to new medicines or interactions between medicines or alcohol. Abnormal blood pressure, low blood sugar and dehydration may also be causes.
