Hearing Heart Beat in Ear?

This has been going on for as long as I can remember. Everytime I do something that makes my heart rate raise, I start to hear a pounding sound in my ear and on some occasions, it sounds like a wave crashing or like salt being poured. This is usually if I have my head rested against something soft like a pillow. 

:/ what’s going on and is it bad? 

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