Only when the doctor is informed of the exact state of the patient’s pain can he/she provide the right treatment, including the type, method and dosage of pain medication, etc., based on a good understanding of the patient’s pain condition. Pain itself is a personal subjective experience, so no one but the patient can know the exact state of the patient’s pain, including the nature and extent of the pain. Even the patient’s closest family members can only say that the patient is currently in a lot of pain, a little pain, and so on. This does not help the physician understand the patient’s condition. Therefore, the assessment of pain can only be done by the patient himself. Cancer pain is also a type of pain, so the assessment methods that are generic to pain are many times applicable. Since the perception of pain is quite subjective, patients need to be patiently taught to properly perform the assessment before treating the pain. Cancer pain assessment includes the following aspects: Assessment of pain level 1. Visual analog scoring method: This method is more sensitive and comparable. The specific practice is to draw a 10 cm horizontal line on the top of the paper, with 0 at one end of the line indicating no pain; 10 at the other end indicating severe pain; and the middle part indicating different degrees of pain. The patient is asked to draw a mark on the line according to his or her self-perception, indicating the degree of pain. 2. Assessment scale method: It is a pain estimation scale designed by McGill in the United States. That is, 0 equals no pain, 1 equals painful feeling but not serious; 2 equals mild pain and patient is uncomfortable; 3 equals pain and patient is in pain; 4 equals more intense pain and fearful feeling; 5 equals severe pain. Specific descriptions are made by the patient through a question and answer format. The content includes: the degree of pain, location, nature, attack and accompanying symptoms, etc. 3. Oral assessment method: It includes words to describe various pain levels, such as mild pain, severe pain, paroxysmal pain, terrible pain and unbearable pain, etc. to help patients describe their pain, so that they can better express the pain and report it in the order of 0 to 10 points, with 0 points indicating no pain and 10 points indicating severe pain. This method is simple, but it is not easy to detect subtle changes. 4. The assessment of pain should also include: the nature of the pain (such as knife-like, fire-like, pinprick-like, electric shock-like, soreness, numbness, ants crawling, heavy hammering and pressure, etc.); the site of the pain (whether there is a clear pain site, whether there is pressure, etc.); the cycle of the pain (whether it is continuous pain or periodic intermittent pain, whether there is any kind of posture that can relieve or aggravate the pain, whether the daytime and nighttime pain (whether the pain is similar during the day and night, etc.). It is important to tell the doctor as much as possible about the above information to help him/her choose the most reasonable treatment plan. For example, you can prepare a record book or a piece of paper to record the time and dose of pain medication, the pain after taking the medication, the physical and mental state after taking the medication, and the urine and stool situation, and bring it to the doctor at the next treatment time. The treatment cycle is usually one week.