There are several reasons for peripheral nerve injury: 1. It may be due to trauma. For example, brain skull trauma or brain contusion, brain blunt contusion and so on, when the brain by these traumatic injuries, in addition to the central nervous system will cause direct damage, can also indirectly cause damage to the peripheral nerve. 2, may be due to malnutrition. Because the peripheral nerve to maintain normal physiological function and structure, need specific nutrients, such as amino acids or trace elements calcium, iron, zinc, selenium, etc., if the lack of these trace elements or amino acids, can also lead to indirect damage to the peripheral nerve. 3, may be due to lifestyle habits. For example, smoking, drinking, staying up all night, eating greasy and spicy food, or food with high fat content, etc., can cumulatively cause peripheral nerve damage.