I'm a physician myself. I'm glad to see that others are experiencing the same symptoms as me. I began to have an intermittent rhythmic vibration sensation in the lateral aspect of the sole of my right foot about 3 days ago. It almost seems to be along the S1 spinal nerve distribution but my proximal sensation along the same nerve distribution is spared. This makes me want to rule out an S1 spinal nerve impingement as the cause.
I also have considered poor circulation as the etiology of this rhythmic vibrating feeling. I don't believe this is the case though. The rhythm doesn't coincide with my pulse rate, and also I have strong anterior tibialis and dorsal pedis pulses, as well as warm toes and normal distal capillary refill.
The other thought of course would be a lesion of my spinal cord or my left medial somatosensory cortex precisely where the sensation of the right lateral foot is received. This is certainly a possibility; an unlikely one but one that must remain in my differential diagnosis if the symptom doesn't subside or even gets worse. I'd have to get an MRI to look at these possibilities though, and I'm gonna hold off on that right now.
And, it could also be from something leading to a metabolic cause such as a pituitary, thyroid or parathyroid disorder. Or, it could be from some autoimmune cause, etc. I doubt that though because the symptoms are too localized. I'd actually hold off on the exotic blood work to identify some of these things unless my basic labs were out of wack and/or imaging studies were negative or inconclusive.
Like most of the rest of you I've carried my cell phone (palm treo) on vibration mode in my right pocket for some time now. So, the thought does come to mind that there might be some correlation between the phone and my new onset vibrating sensation. I am not carrying my phone in my pockets anymore....and we'll see what happens.
I actually was very impressed with ChiroBob's explanation and it is certainly one I had not considered. I did some research after reading his posting, and there may be some credence to it.
It is possible that only the sole of my foot is affected is due to the high concentration of Meissner's corpuscles in the palms and soles, and paucity of them along the thigh and lower leg.
Meissner's corpuscles are the nerve endings responsible for tactile sensation of vibration. I'll have to do some more research but I wonder if the frequent vibrating of my phone did have some affect on lowering the threshold of the action potentials generated from these nerve endings.
So its quite possible that as my cell phone has been vibrating, its been causing a nervous impulse to be transmitted in a retrograde fashion down my S1 nerve root, and thus altering the morphology of my Meissner's corpuscles.
Of course this is theoretical for me. I don't really recollect, or likely never learned the biochemical makeup of Meissner's corpuscles, and how they are changed by repetitive potentiation of the, or what ions need to pass through what membranes to generate the action potentials, etc, etc., etc..
At this point, I'm gonna keep the phone out of my pockets, try to keep it on soft ring or silent mode, and see if it goes away in the next week or two. I sure hope so because it sure is annoying and I really don't want the cause to be from something more serious.