Hissing sound in my head

I am in my early 60's and have high blood pressure and low potassium.  I have a hissing in my head and can hear my heart beating when I'm stressed or excited.  When I'm relaxed I still hear the hissing in my head.  Can you tell me what is causing this?

[dolfnlvr]

Can you provide a little more detail?  I'm not sure I understand what you are describing when you say you hear a "hissing" in your head.  Is it constant?  Pulsing?

[ireneo]

Hi,I think I answered your similar question on another board but can't remember where. I was thinking it might be a form of tinnitus. Tinnitus can be hissing as well as ringing or humming. Do you take many nsaids like aspirin?

[imcool09]

i have a noise in my head also......i had an mri, they said i have slight hardening of the arteries, but he had no idea what the noise is....sometimes its very loud....kind of like static, or like and electrical buzz............it gets loud, tho. It's not coming from my ears.
I keep thinking maybe my blood isnt flowing correctly, and its squeezing thru?   I have no idea.
I wish it would stop!!  Very annying and worries me all the time.  

[yarrow]

You can find some possible answers by googling 'tinnitus' and 'pulsatile tinnitus.'