Should not be: A constant rate of 120/min for 2 months is not just fine nor should it drop suddenly and get SOB. You need to be seen again right away and checked for a lung blood clot particularly if you are on birth control pill or sit for long periods of time. Overactive thyroid could cause the 120 for 2 months but not the sudden drop with SOB, go be checked out today.
Answered 3/6/2016
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