It means blood is: circulating into your head (brains). You want to hear it as long as you're alive! You need to not tunE into it as much, just like hearing your heart beat! If you didn't hear it, then you should really be worried! Don't get anxious over it. When it's quiet at night, it's more audible. It's a good thing! Use white noise of waves or nature sounds to distract you if irritates or worried by it.
Answered 7/20/2015
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4 doctors weighed in across 2 answers
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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