Herpes zoster is a condition of blisters, redness and pain in the corresponding skin area. Herpes zoster usually heals after about 4 weeks, however, some people still feel pain in the healed skin area, the pain lasts for more than 3 months. At that time, the patient is diagnosed with post-herpetic neuralgia. Although post-herpetic neuralgia does not directly threaten the patient's life, it makes the patient uncomfortable, directly affecting work and life.

Pain is an abnormal manifestation of the body, a common symptom in clinical practice. Pain can be divided into three types based on the cause of the pain sensation: nociceptive pain, neuropathic pain and psychogenic pain. In this article, we will learn more specifically about neuropathic pain.