The causes of peripheral neuritis are diverse and include the following: 1) genetic factors: many genetic diseases can cause transient or even permanent damage to the peripheral nerves, manifesting as peripheral neuritis; 2) autoimmune diseases: the most common factors of peripheral neuritis, such as Guillain-Barré syndrome, patients have a history of colds, diarrhea and other prodromal diseases, viruses and bacteria induce the body to produce autoimmunity, which triggers peripheral nerve damage, manifesting as peripheral neuritis; 3) other factors: physical and chemical factors such as heavy metal poisoning, metabolic diseases such as diabetes, amyloidosis, etc.