1. What is cancer pain? Pain is an unpleasant sensation and emotional feeling, one of the most agonizing and unbearable symptoms for cancer patients, and its threat is sometimes even worse than the threat of death. The average person cannot even imagine that kind of pain if they have not experienced it. Cancer pain brings patients not only physical pain, but also often leads to insomnia, depression, anorexia, neurasthenia, emaciation, resistance to treatment, etc. Cancer pain affects not only the patients themselves, but also their family members and friends. 2.Why do cancer patients suffer from pain? Tumor growth in the early stage usually does not cause pain, when the tumor cells invade or press the nerves can produce severe pain. Tumor cells invade blood vessels or lymphatic vessels, which can also cause pain. Tumor cells secrete factors that cause pain. Others, such as liver cancer invading the liver peritoneum can cause pain in the liver area. Intra-abdominal implantation of carcinoma can produce abdominal pain, and obstruction of the digestive tract caused by intestinal tumor can result in abdominal pain. Nasopharyngeal cancer invades the trigeminal nerve and causes headache and so on. Generally speaking, the symptoms of persistent and severe pain are mostly in advanced stage of cancer. Common locations of cancer pain include chest and back, head and neck, abdomen, pelvis, bones and chest. In addition to the above reasons, surgical treatment and radiation therapy can also cause new pain areas or form new sources of pain. 3. Can cancer pain be controlled? Clinical practice at home and abroad proves that with standardized individualized treatment according to different patients’ conditions, the pain of 85% of cancer patients can be effectively relieved, and the pain of more than 75% of advanced stage patients can be relieved. 4.What are the main obstacles affecting cancer pain control at present? At present, the reasons for the failure of good control of cancer pain include the following: (1) patients/families often ignore the existence of pain; request pain relief treatment only when the pain is severe; fear of addiction to pain medication; (2) medical personnel receive obvious insufficient education on pain treatment; ignore the existence of pain; pay insufficient attention to the evaluation of pain and be precise; worry too much about the side effects of pain medication; (3) the current management policy of anesthesia and medication restricts pain relief; (4) the current management policy of pain medication restricts pain relief. (3) The current anesthesia management policy restricts the use of pain medications. 5. Are the side effects of pain medications frightening? At present, the side effects of pain medications commonly used in clinical practice include: (1) constipation is relatively common, and can generally be improved by taking diarrhea-relieving medications regularly; (2) nausea and vomiting may occur in some patients in the first few days, and can be gradually reduced or significantly improved by the application of medications; (3) drowsiness is not usually seen at pain-relieving doses unless the medication has been overdosed, or relieved on its own in a few days; (4) respiratory depression is relatively rare, and requires medical care; (5) the use of pain medications is not a cause for concern. (4) Respiratory depression is relatively rare, which needs to be rescued under medical personnel; (5) Addictiveness will not appear under the dosage of pain control, so there is no need to worry too much about the dependence and addictiveness of the drugs and deprive patients with cancer pain of the need for pain relieving drugs. 6. How to reasonably apply painkillers? Cancer pain control should be formulated by oncologists with experience in cancer pain diagnosis and treatment, specifically according to the patient’s pain history, pain site, type and nature, the patient’s psychological state, detailed physical examination, meticulous scoring, formulation of the plan, and then adjusting the plan according to the therapeutic effect.