Question
There is a rumble noise I can make in the back of my head (between my ears.) I can voluntarily make the noise happen by just thinking about it. It sounds almost like quiet thunder. I can make it last for 6 or 7 seconds, but usually for only a few seconds. I am just curious about what this is.

Answer
Hi Peter,

I have no idea from the info given.  With an examination and closer questioning, a doc might be able to give you a good theory.  

Examples might be subconscious tightening of suboccipital muscles causing a crepitus in the atlanto-occipital cartilage or simple awareness of a bruit in the artery.   

These are purely speculative.  It is too vague as it stands.

Sorry.  Wish it could be more definitive.

God bless, Dr Pendergraft

PS  If you want to pursue this I'm at [email protected]