1, local changes: 1 month after the clinical cure of acute herpes zoster there is still persistent or episodic severe pain in the affected area, and tenderness is obvious; pigmentation is visible in the affected area. Some patients are afraid to wear clothes for fear of severe pain caused by the friction of clothes, and even use homemade devices to protect the local skin. 2, sequelae symptoms: most patients in the lesion area in addition to pain can also appear abnormal sensation, ankylosis, itching, tightness, numbness or irregular twitching and other uncomfortable sensations, etc., than pain is unbearable, the clinical course of the disease often coexists with pain symptoms, in the vast majority of patients longer than the pain period. 3, the nature of pain: the sudden cut-like or lightning-like attack pain or continuous burning pain is the main, can not be touched, even clothing rubbing can cause “burning” kind of burning pain, most patients’ pain is unbearable, in addition, the pain area can be mixed with numbness or itching, very few patients lack of typical neuralgia symptoms. Very few patients lack typical neuralgia symptoms. 4. Psychological abnormality: Due to the fear of severe pain, patients often have a heavy psychological burden and depression, and even lose confidence in life.