Numbness of the big toe on the foot may have the following causes: first, local dermatomal neuritis, when the dermatomal nerve on the back of the foot is inflamed, the symptoms of numbness of the skin in the dominant area can appear, which can also be manifested as numbness of the big toe, and this should be diagnosed by early physical examination; second, toe neuritis and toe neuroma, when the toe nerve of the big toe is inflamed and tumor, it can also appear as numbness of the big toe. Third, lumbar spine diseases, when the lumbar disc herniation or lumbar spinal stenosis, lumbar spine slippage serious, compression of the nerve root, can appear on the foot bunion symptoms, then early lumbar spine X-ray, CT, nuclear magnetic examination, for early diagnosis and early treatment If the peripheral nerve, such as the common peroneal nerve, is compressed in its course, the symptoms of bunion can also appear, and the diagnosis should be made by physical examination and electromyography.