Pain is an unpleasant sensation or emotional experience caused by tissue damage or potential tissue damage, and is an innate human sensation. The World Health Organization has ranked pain as the fifth most important vital sign. Pain is one of the most common symptoms of cancer patients, which seriously affects the quality of life of cancer patients. The incidence of pain in primary cancer patients is about 25%; the incidence of pain in advanced cancer patients is about 60%-80%, and 1/3 of them have severe pain. What is cancer pain? Cancer pain (hereinafter referred to as cancer pain) refers to the pain caused by cancer, cancer-related lesions and anti-tumor treatment. (1) Tumor-related pain: caused by direct invasion and compression of local tissues by tumor, and metastasis involving bone and other tissues; (2) Antitumor treatment-related pain: commonly caused by surgery, traumatic examination operations, radiation therapy, and cytotoxic chemotherapy drugs; (3) Non-tumor-related pain: caused by tumor complications or other comorbidities. pain. What effects will cancer pain cause? When cancer pain is not relieved, patients will feel extremely uncomfortable, which may cause or aggravate symptoms such as anxiety, depression, fatigue, insomnia, loss of appetite, etc., and seriously affect patients’ daily activities, self-care ability, interaction ability and overall quality of life, and even lose the hope of survival. Therefore, analgesic treatment is a treatment measure that should and must be actively taken for cancer pain patients! Patients with cancer pain do not need to endure pain, but should pursue continuous and effective pain relief, minimize psychological burden, control somatic symptoms as much as possible, and maximize quality of life. Pain level assessment The drug regimen for different levels of pain varies. Accurate assessment of pain level is a prerequisite for reasonable and effective pain relief. How severe the pain really is can be represented by the corresponding number. The pain level will be represented by 0-10 numbers in order, with 0 indicating no pain and 10 indicating the most severe pain. Choose the appropriate number according to the degree of pain or expression.