The causes of one side of the foot numbness is more, common causes are brain lesions, spinal lesions, peripheral neuropathy, peripheral blood circulation disorders. 1. Brain lesions: the more common clinical lacunar cerebral infarction, brain tumors, etc., lesions involving the patient’s sensory nerves, can cause one side of the foot numbness symptoms, and more often accompanied by dizziness, slurred speech, limb inflexibility and other symptoms. 2. Spinal lesions: such as lumbar disc herniation, lumbar spinal stenosis, etc., if the lesion tissue on the nerve root caused by compression, it will lead to one side of the lower limbs innervated by the numbness, especially in the feet. 3. Peripheral neuropathy: for example, peripheral neuropathy and peripheral neuritis caused by diabetes and other underlying diseases, trauma to the saphenous nerve, peroneal nerve, etc., can also lead to numbness on the affected side of the foot. 4. Peripheral blood circulation disorders: for example, the foot long time pressure, resulting in insufficient blood supply to the foot, the patient may appear on one side of the foot numbness. In addition, arteriosclerosis of the lower limbs, embolism, etc. can also lead to insufficient blood supply to the feet, which in turn causes numbness on one side of the feet. It is recommended that one side of the foot numbness, go to the hospital in a timely manner to improve the auxiliary examination, in order to clarify the cause of the disease.