Common causes of numbness in the big toe include lumbar spine disease, diabetes, neurological factors and vascular factors. 1. Lumbar spine disease: Patients with lumbar disc herniation or lumbar spondylolisthesis often experience numbness in their bunions when the spinal nerve roots are compressed. CT and MRI of the lumbar spine can be performed to help diagnose such cases. 2. Diabetes mellitus: diabetic peripheral neuropathy patients, if combined with peripheral nerve damage, can also cause the clinical symptoms of big toe numbness. 3. Neurological factors: common patients with cerebral ischemia and hypoxia, usually with contralateral distribution. For example, left-sided cerebral infarction will cause numbness of the right big toe, and there will also be hemiplegia, hemiplegia, aphasia, ataxia and other symptoms. 4. Vascular factors: if the lower extremity blood vessels exist stenosis, hardening, plaque, etc. will cause ischemia, big toe numbness is a common manifestation, you can improve the lower treatment of venous blood vessels to clarify the diagnosis. There are many other causes of numbness of the big toe, you need to go to the hospital as soon as possible, according to the specific condition of the doctor, to develop individualized diagnosis and treatment plan, so as not to delay the condition.