I too have this little Buzzing Bee on my left side of my Chest near the Heart area. Had a triple bypass 18 months ago. It's been there ever since. been told by my local GP that he thinks it is to do with the Muscle. As long as it is not another partly blocked Vane then I am pleased. I am off to have a Nuclear Heart Stress test done in a week to make sure there is nothing to worry about. If all is clear then I am in clined to think that it is to do with electrical impulses or a nerve or both. I'll report back when I know more if I think it will help others.
I've also had this vibration right behind my left breast off and on for two months. I first blamed it on cell phone vibrating, but it happens without the cell phone and I almost never have my phone on vibrate. Searching the web, I see many who have vibration have had extensive heart tests and chest x-rays and it hasn't been related to any of those problems. I am quite certain my vibration is not related to either my heart, which is fine, or from the diaphragm or any lung disease, which are also fine. Its frequency is very close to that of cell phone on vibrate. It doesn't seem to me to be a nerve or muscle problem.
Mine occurs only on exhaling or inhaling, so it is definitely related to passage of air. It seems too far from the diaphragm or heart to be from those sources. I am not an anxious person, it seems very unrelated to anxiety.
I am convinced it is like a low-frequency "whistle" occurring at an air-passage orifice within the lung right behind, very close behind my left nipple, caused by the passage of air through the orifice, similar to air passing through pursed lips causes a whistle. This is not an audible whistle, and going even farther, it's probably not really a true whistle, which is a vibration of air only, but is probably a tiny bit of membrane or tissue which vibrates or rattles rapidly as air passes by it.
It is sort of disturbing but I am not worrying about it.
Dave Bunting, very good health, age 70
***@**** --- but correct cxx to com
if you are a doctor, have you tried talking to any of your colleagues?
stress unfortunately is a get out clause for most doctors, i suppose it's easier and cheaper to diagnose.
have you tried wearing a mobile ecg monitor to record these vibrations?