Numbness of the big toe may be caused by local compression, trauma, peripheral neuritis, lumbar spondylosis, diabetic peripheral neuropathy and other factors. 1. Local compression: for example, the big toe is compressed for a long time, so that the local blood circulation becomes poor, will lead to numbness of the big toe, should be lifted to relieve the compression, appropriate activities, to be able to recover on their own. 2. Trauma: For example, if the big toe is hit by a heavy object, resulting in damage to the nerves in the big toe area, it will cause numbness, which may be accompanied by severe pain, swelling and other symptoms. 3. Peripheral neuritis: For example, prolonged malnutrition, prolonged alcohol consumption and other factors may lead to peripheral neuritis, which may cause numbness of the big toe or fingers. 4. Lumbar spine lesions: for example, lumbar spinal stenosis, lumbar spine slippage, lumbar disc herniation and other lesions may cause compression of the innervation of the lower limbs neurovascular, which will cause numbness of the big toe, accompanied by lower limb radiating pain, lumbar pain and other symptoms. 5. Diabetic peripheral neuropathy: diabetes lasts for a long time, leading to nerve damage, which can cause tingling in the big toe, accompanied by drinking, eating, frequent urination, fatigue and other symptoms. Big toe numbness lasts for a long time and is accompanied by other clinical symptoms, it is recommended that timely medical examination and treatment.