A normal blood pressure reading should be lower than 120/80. That being said, I agree with the previous comment that 48 is on the low side and recommend consulting withe your MD to make sure there are no underlying issues causing a lower than normal diastolic blood pressure. Most likely simple dehydration is the root of the problem, but still worth checking out.
Here is a good article that offers several possible reasons for a low blood pressure - Can Blood Pressure Be Too Low?
All the best,
Lisa Nelson, RD, LN
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