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    Are you tired or dizzy at the end of the day?
    Mark Stacy, MD posted:
    If the answer is yes, check your blood pressure sitting and standing. If the top number is dropping more than 20 points - or below 100, you may need to discuss further with your doctor. For example, if your sitting blood pressure is 110/70 when you are sitting, that is great - right? Now stand up and wait 30 - 60 seconds. Recheck your blood pressure. If it drops to 90/50, you may be a bit dehydrated. Drinking a glass of water at breakfast and lunch may be all that is needed to help this. Other things to raise blood pressure include talking with your doctor to reduce any medications that lower blood pressure, and after that increasing the salt in your diet or trying medications available to raise blood pressure.
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