The Ministry of Health stipulates that pain medicine is responsible for the treatment of chronic painful diseases. Pain for more than one month or recurring is prescribed as chronic pain. Common chronic pain disorders are: Intervertebral disc pain: characterized by pain or numbness in the lower back, legs or neck, shoulders and arms caused by prolonged sitting, standing or walking, and relieved by lying down. Such as posterior headache, arm pain, shoulder pain, lumbosacral pain, sciatica, etc. Cervical spondylosis: divided into six types, characterized by soreness or burning pain in the head, neck, shoulders and back, numbness in the arms, dizziness and tinnitus, panic and vomiting, etc. Joint pain: characterized by swelling and pain or redness of joints. For example, inflammation of knee, elbow or ankle joints, etc. Neuralgia: characterized by paroxysmal pain such as lightning-like, knife-cutting, burning, pinching, pulling or numbness. Such as trigeminal neuralgia, sciatica, arm pain, herpes zoster neuralgia and post-herpetic pain, diabetic neuralgia, etc. Head and facial pain: such as trigeminal neuralgia, cervicogenic headache, migraine, etc. Myofascial pain: characterized by soreness and pain of neck, shoulder and waist, local pressure pain, pain from cold, night or morning, relieved after activity or physical therapy. Such as neck and pillow pain, frozen shoulder, lumbar and back muscle strain, hip and leg pain, heel pain, etc. Osteoporotic pain: characterized by turning pain and waking pain, such as vertebral compression fracture or metastatic cancer. Ischemic pain: vertebral artery type cervical spondylosis, vasculitis, femoral head necrosis, Raynaud’s disease, etc. Systemic pain: such as osteoporosis, fibromyalgia, ankylosing spondylitis, somatization disorder, etc. Cancer pain: such as tumor invasion pain or metastasis pain, etc.