Peripheral neuropathy is caused by a deficiency of vitamin B1. Vitamin B1 mainly exists in grains, legumes, nuts, lean pork meat, liver (including the liver of pig), kidney, heart and yeast. The reasons for the deficiency of vitamin B1 are as follows: 1. Insufficient supply due to an unbalanced diet. 2. Incorrect methods of milling and cooking. 3. Increased requirement or consumption, such as pregnant women, lactating mothers and those engaging in heavy physical labor. 4. Diseases that stimulate metabolism, such as hyperthyroidism, diabetes, infections, fever and so on. 5. Chronic alcoholism.