Pain is an unpleasant subjective sensory and emotional experience associated with tissue damage or potential tissue damage and is a complex physiological and psychological activity. Although pain can be induced by serious illnesses, there are other aspects of pain that have no obvious trigger. Nowadays, many hospitals have set up pain departments, but many people are not clear about what conditions to see the pain clinic. Acute pain can become chronic if left untreated Pain receptors are located in free nerve endings in the skin and other tissues. Various injurious stimuli act on the body to a certain extent, can cause the damaged part of the tissue to release certain pain-causing substances, such as histamine, bradykinin, 5-hydroxytryptamine, acetylcholine, H +, K +, prostaglandins, etc. These substances act on the nociceptive receptors to produce nociceptive impulses, and rapidly along the afferent nerves to conduct to the spinal cord, through the thalamus bundles of the spinal cord and the spinal cord reticular fasciculus upward, to the thalamus, and then project to a certain part of the cerebral cortex to cause pain, which can lead to the pain. The pain sensation is caused by a certain part of the cerebral cortex. If acute pain is not effectively treated in time, structural changes can occur centrally and locally, turning it into chronic pain. Different parts of the pain, its characteristics, onset time, pain level, accompanying symptoms are different. In addition to pain, it is accompanied by increased blood pressure, increased heart rate, sweating, end coldness, loss of appetite, lack of energy and inability to work normally. When should you go to the pain clinic The pain clinic is a special department of the hospital, which is a medical unit for the diagnosis and treatment of pain and painful diseases. Pain diagnosis and treatment is a multidisciplinary cross-cutting field involving many clinical specialties, so the scope of specialization is relatively wide, and the scope of diagnosis and treatment includes: all kinds of acute and chronic pain, such as trigeminal neuralgia, migraine, frozen shoulder, cervical spondylosis, lumbar spondylosis, senile osteoarthropathy, post-herpetic neuralgia, as well as advanced cancer pain, long-term post-operative pain, phantom limb pain after amputation, and so on. Any chronic, long-term pain that bothers people’s life and health can be treated in a pain department or pain center. Although the pain department in many hospitals has become more mature, but half of the pain patients visit the clinic did not first think of hanging the number of the pain department, such as lumbar disc herniation patients will go to orthopedics treatment, and women’s back pain will hang the number of gynecology …… At present, there is no obvious causative factors caused by the pain of the patient is more, they do not know to go to see what the department, many patients turnaround several departments before reaching the pain department. One might ask, if you have chest pain, should you go to pain medicine or cardiology? How exactly do you differentiate between pain medicine and other departments? The decision of which department to visit should be based primarily on the nature of the pain. If the chest wall pain and herpes should go to the pain department; if it is the heart pressure pain, boring pain can see the cardiology department; if it is pleurisy caused by the pain is related to the respiratory, should go to the respiratory department for treatment. Generally speaking, for the cause of the disease has not yet been identified or even if the cause of the disease is identified but there is no cure for the pain, can see the pain department. In fact, many chronic pain as well as non-organic pain belongs to the scope of treatment of the pain department, we must correctly recognize that chronic pain is also a disease, in the occurrence of pain to seek timely treatment of pain doctors, pain is not only very detrimental to the organism, but also the patient will be forced to endure the pain and miss the best time for treatment. If more people can correctly recognize the pain, timely and reasonable choice of diagnosis and treatment methods, more people will be free from its suffering.