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Low h.r

when I am super relaxed i.e havent moved around very much I notice my h.rate drops to even 50's..and even though its not all the time I am kinda worried. It speeds up when I get up do chores etc and when I exercise I've seen it go even 138/140.

I have lost a bit of weight (intentionally) and dont eat much but I make sure I eat all the right foods like banana, meat, salad, nuts and some grains , cheese etc..I work out 2-3 times a week for 5 yrs now .  

Right now in bed and its 56..I dont have symptoms. Should I be concerned?

I am 43 and have Hashimoto underactive thyroid
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973741 tn?1342342773
You are a young person!  So, that number of 138140 can't be right?  That's not your blood pressure, correct?  That is heart rate? If so, that makes more sense and is normal for exertion.  Your heart rate upon resting is a bit lower than normal of 60 to 90 (max 100).  Heart rate below 60 is called bradycardia.  For some people, a low heart rate (under 60 at rest) isn't a cause for worry but it also can be a sign that there is an issue with the heart's electrical system.  You need this electrical system to function properly to keep the heart beating properly.  Do you ever feel faint or dizzy?  One thing I know of that can cause this is dehydration.  How's your liquid intake? Thyroid disease is known to be a cause of bradycardia.  I'd mention all of this to your doctor.  Here's some more information. https://www.webmd.com/heart-disease/atrial-fibrillation/bradycardia#1
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