Cancer pain is the great public health enemy of the 21st century. Worldwide, 9 million cancers occur each year, 20-50% present with pain at diagnosis, most advanced cancer patients experience pain, and at least 4 million people suffer from cancer pain every day. Therefore, cancer pain should be taken seriously, and current medical treatment has been able to relieve pain in 80% of patients. However, the problem of inadequate pain management for cancer pain patients is still very prominent. The main reason is that medical professionals and the public have stereotypes and even misconceptions about cancer pain and pain medication. Misconception 1: Pain medication is used only when the pain is severe. In fact, it is safer and more effective to use painkillers on time and at lower doses. Patients who do not receive long-term pain relief are prone to anxiety and difficulty in sleeping and eating, which affects their quality of life, and the resulting wasting and exhaustion make patients unable to tolerate primary treatment (such as surgery, radiation and chemotherapy). Myth 2: It is safer to use non-opioid drugs. For patients who need long-term pain medication for chronic cancer pain, it is safer and more effective to use opioids (such as morphine). The side effects of non-opioids are easy to ignore, and their effects have a “capping effect”. For patients with moderate to severe cancer pain, opioid painkillers have an irreplaceable position. Myth 3: The use of dulcolax is the safest and most effective painkiller. In fact, because of its high toxicity and poor pain-relieving effect, WHO has listed dulcolax as a non-recommended drug for cancer pain treatment. Myth 4: Morphine is addictive. Experimental research and clinical practice have confirmed that addiction rarely occurs when morphine or transdermal patches are taken orally by cancer pain patients. Once opioids are used, opioids can be safely stopped at any time if the cause of cancer pain is controlled and the pain disappears. Myth 5: Cancer patients taking morphine means they are facing death. According to foreign data, the correct application of morphine prolongs the life of cancer patients due to: 1) no pain; 2) improved rest and sleep; 3) enhanced appetite and physical fitness. And the application of opioids is not based on the expected length of life, but on the degree of pain. To sum up, cancer patients should consult oncologists with strict formal training, follow the “three-step” treatment principle of cancer pain treatment, and use painkillers scientifically and reasonably for the best treatment effect.