Many causes, Seth: First, be sure you measure it at complete rest - it's supposed to race if you're busy. If it continues to race, common causes can include: infection, anemia, pain, anxiety, thyroid excess, caffeine (from coffee or cocoa), and many rare causes.
Answered 10/7/2017
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
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