There are several common causes for the lack of sensation in the bunions: 1. local inflammation, injury, infection, etc. of the big toe, resulting in abnormalities in the local sensory nerves, thus causing the symptoms of lack of sensation. 2. visible in the sciatic nerve of the lower extremity is affected, such as the common lumbar disc herniation compressing the nerve roots of the sciatic nerve of the lower extremity, which will lead to the symptoms of lack of sensation in the big toe. 3. visible in Central system diseases, such as lacunar infarction, cerebral infarction, etc., can cause the absence of sensation due to lack of oxygen and ischemia in the corresponding sensory area.4. Diabetes, diabetic patients often develop peripheral neuritis and vasculitis, which can also cause symptoms of no sensation in the extremity. Patients are advised to go to the hospital for a detailed examination, as there are more causes involved.