Let us first look at the definition of pain: pain is a complex combination of physiological and psychological and other factors that accompany existing or potential tissue damage and is subjectively felt. The emphasis on pain as a subjective feeling of the patient suggests that the assessment of pain intensity should be based on the patient’s own complaints. That is why Article 19 of the Internal Medicine states that “all pain, swelling and itching belong to the heart” instead of “all belong to fire”. There are many causes of cancer pain, but the pain directly caused by tumor is the most common, accounting for 88%, which can be seen in: 1. 2.Compression: brain tumor can cause headache. Retroperitoneal tumor compressing lumbar and abdominal plexus can cause lumbar and abdominal pain, such as pancreatic cancer. 3.Obstruction: When breast cancer metastasizes in axillary lymph nodes, it can compress axillary lymph and blood vessels causing swelling and pain in the affected limbs and arms. 4.Tension: When the primary and liver metastasis tumor grows rapidly, the liver envelope is overstretched and tensed, which can cause severe distension and pain in the right upper abdomen. 5.Tumor ulceration, long-lasting and infection may cause severe pain. From the above, we can see that the pain caused by tumor is mostly related to the increase of pressure, and the pain can be relieved immediately after we reduce the pressure through drugs or other treatments. In fact, the causes of many diseases do not need to be thought too complicated, once the most critical and direct points are clearly thought out, the treatment will be easier. Secondly, cancer treatment can also cause pain, and this pain accounts for about 11%: such as radiation neuritis, stomatitis, dermatitis, etc. The pain of phlebitis and tissue necrosis caused by chemotherapy drug extravasation also belongs to this category. There are more treatment means, the first one is drug therapy, the principles of drug therapy for cancer pain: 1, try to give drugs orally for long-term use, which can reduce dependence and addiction; 2, give drugs regularly and on time, instead of giving drugs when pain occurs; 3, give drugs according to the step, according to the WHO recommended “three-step therapy” for cancer pain; 4, drugs should be given according to the “three-step therapy”; 4, drugs should be given according to the “three-step therapy”. “The use of medication should be individualized; 5. Pay attention to the use of anxiolytic, antidepressant and hormonal adjuvant drugs, which can improve the effect of analgesic treatment. Special reminder is: morphine drugs should be swallowed whole, not grinded or chewed. Next are surgical treatment, chemotherapy and radiotherapy, minimally invasive treatment, and bone nucleotide and bisphosphonate treatment. The role of Chinese medicine in the treatment of cancer pain is also better, it can reduce cancer pain and prevent cancer pain, which is comparable to modern medical treatment. The following discussion focuses on the role of TCM in treating cancer pain. Reasons for choosing Chinese medicine to treat cancer pain Morphine-based drugs are used to treat cancer pain. Morphine can only provide temporary relief to some cancer pain patients, but cannot solve the fundamental problem, and the dose of morphine needs to be increased constantly; morphine is effective in treating visceral pain, but not in treating other pains; some patients will develop morphine poisoning and cannot continue to apply morphine-based drugs; some patients are afraid of morphine addiction. Some patients are afraid of morphine addiction and do not accept morphine-based drugs; some patients also refuse to apply morphine-based drugs because they are afraid of morphine-induced dyspareunia. According to statistics, 50% to 80% of pain is not effectively controlled for various reasons. Patients like Chinese medicine because it is not only fast-acting and long-lasting, but also has very little toxic side effects, no drug resistance and addiction. It also has better effect on cancer pain that cannot be treated by modern medicine.