1. The presence of pain indicates that the cancer has progressed to an advanced stage. Only patients with advanced cancer will experience severe pain. Pain can occur at any stage of cancer. Even during the treatment process or some treatment methods themselves may trigger or increase the occurrence of pain, such as peripheral neuralgia after chemotherapy, radiation neuritis after radiotherapy, chronic incision pain after surgery, and so on. Only among advanced cancer patients, the percentage of pain occurrence is relatively high. 2. Dulcolax is a safe and effective analgesic most suitable for cancer pain patients. Dulcolax is not suitable for cancer pain treatment. Firstly, its analgesic strength is not as strong as morphine, only 1/10 of morphine; secondly, its action time is short and it needs to be injected several times a day, which is very easy to become addicted. On the other hand, the opioid controlled-release, extended-release and patching agents commonly used in clinical practice not only have good analgesic strength, but also have a longer duration of action, which are convenient, simple and safe to apply. Thirdly, the metabolites of Dulcolax enter the body with high central neurotoxicity and long half-life, and repeated use of large quantities will certainly cause accumulation in the body and neurotoxic symptoms. Therefore, the World Health Organization and the Ministry of Health of China have listed dulcolax as a non-recommended drug for cancer pain treatment, and have been pushing morphine, especially for the treatment of late stage cancer pain. 3.Tolerate cancer pain as long as you can, and consider using analgesics only when it is severe. Some people think that “medicine is three parts poisonous”, so they clench their teeth as long as they can bear the pain, and are not willing to use analgesics. It is not known that prolonged pain without effective treatment can easily lead to sympathetic nerve dysfunction, local or systemic pain allergy, pain hypersensitivity and even intractable pain, which makes pain treatment more difficult and increases the amount of analgesic drugs. 4, fear of addiction and refuse to use morphine and other opioid analgesics “The use of morphine is equivalent to drug addiction, two or three times and then addicted.” It is this misconception that makes many pain patients refuse morphine. Clinical practice proves that when pain exists in the body, even long-term, high-dose morphine use is not addictive. When the cause of pain is removed and there is no more pain, it is perfectly acceptable to gradually stop the drug. The current clinical use of more and more opioid extended-release tablets, controlled-release tablets, external patches, not only to maintain the analgesic time is long, and the drug in the body to maintain the concentration of both stable and relatively low, more effective in reducing the occurrence of addiction. 5.The increasing dose of morphine use is addiction. The dose of morphine may increase gradually after a long time in the treatment of cancer pain, but it does not necessarily mean addiction. The increase in dose is usually caused by two reasons: (1) the muscle has tolerance to the drug, which is usually called drug tolerance, not true addiction; (2) the pain level has increased, and the amount of analgesic drugs needed has increased. Once morphine is used, it needs to be used for life. The reasonable use of morphine in the state of somatic pain is not easy to become addicted. Moreover, after the use of morphine in cancer pain patients, the pain can be gradually stopped because of surgery and radiotherapy. When the daily dose of morphine is reduced to 30mg-60mg, the drug can be stopped directly. When the pain appears again, morphine can still be used again, so there is no need to worry about “not being able to quit” or “not working”. 7. Refusing to use opioids such as morphine because of nausea and vomiting. Most people who start using opioid painkillers such as morphine will have varying degrees of nausea, vomiting, dizziness and other side effects, and those who are particularly sensitive may even find these side effects more unbearable than pain, and thus refuse to use such drugs. In fact, such side effects as nausea, vomiting and dizziness are short-term side effects of opioids, which will be gradually reduced and disappear after a few days of use (3-7 days), so patients just need to get through this short period of time. 8.There is no way to treat cancer pain with morphine if the effect is not good. Morphine and other strong opioid analgesics are the main and most commonly used cancer pain treatment drugs, but they are not foolproof in treating pain. For example, morphine does not work well for pathological neuralgia. Cancer pain is often a mixed type of pain, often combined with the presence of pathological pain, when morphine is likely to be ineffective, or the dose of morphine increases quickly. At this time, the use of some drugs for pathological neuralgia or selective neurointerventional treatment can often have unexpected effects.