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High blood pressure
needs to be controlled by medication everyday. She must have omitted taking her medication which could be a cause. Also she needs to be evaluated for high blood sugar as well. High BP
can cause serious problems if not tackled appropriately like strokes, heart attack
, kidney failure. Kindly consult her Doctor and get her on a good treatment regime. She needs to avoid added salt in her diet and limit excessive water intake as well. Get her blood lipids
tested as well to know her cardiovascular risk.