You might be diabetic and have what is called microvascular disease. The very small blood vessels of the body are the first to be affected eg. those to the nerves and digits, eyes, kidneys, heart etc. Do you have any wounds on your toes? Diabetics don't heal well. Although just presenting with the big toe on each side is not common.
Check your medication... some medications, even natural remedies cause numbness and/or tingling in the feet.
Are you exposed to any toxins or chemicals at work?
What shoes do you wear? Are they comfortable, or are they compressing your toes?
There are many more possibilities, and you should go to your local doctor to exclude any underlying disease process.
Also:
My God, I had this problem for decades and no doctor took it seriously!!!
Until I was eventually diagnosed with a peripheral neuropathy, a condition that has over 100 different forms and can cause numbness in the extremities in some forms.
See a podiatrist AND a neurologist if you can; find out if your Achilles reflex is absent (mine is) and other tests such as a metal item being run along the bottom of your feet to see if your toes reflexively curl (mine don't; they just spread a little, an abnormal result). Make sure you do not have anemia or poor circulation as well. And rule out rediculopathy.
-- SabrinaSingularity.
I have this same problem. Mine is thought to be Raynaud's. Does stress or cold bring it on? Does wearing shoes or tight socks aggravate it? Is there tingling? Is it ever followed by throbbing pain? Does the toe turn white, then red? Or sometimes blue? Do you ever get similar symptoms in your fingers or the tip of your nose? Mine is odd in that I mainly get it in my right great toe. Most people get in their fingers. After charting the symptoms, it appears to be Raynaud's. I get occasional numbness in my fingers; but I just ignored it.
Are there any other symptoms, like mild vertigo? Auras or transient blindness? That could be Basilar artery migraine.
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Could be a circulatory problem or an impinged nerve with inflammation. Don't leave this one, check with your doctor!