Cancer screening should be selected according to different conditions at different ages. Some irregular medical examinations can delay treatment, while some medical examinations are not a substitute for early cancer screening. Some tumor screening programs have potential pathogenic risks to the human body, which requires oncologists to weigh the choices according to the specific conditions of the examinees. Cancer screening should be selected according to different conditions at different ages. Some unregulated medical checkups can delay treatment, while some medical checkups are not a substitute for early cancer screening. Misconception 1: Health checkup is cancer screening The scope of general health checkup does not fully cover the scope of tumor screening, and the focus is different, so the two cannot be compared with each other. In addition to early detection of tumors inside the body, cancer prevention physical examination will also analyze the factors of tumors in the future, and provide health education and poor lifestyle intervention to the examinees. Misconception 2: Cancer screening can be done as long as one is a doctor. Nowadays, some “screening” is too indiscriminate, and even if one touches or does some random tests, it is considered as participating in “screening”, which will not only fail to detect tumors. This will not only fail to detect tumors, but also make the examinees relax their vigilance, which will lead to misunderstandings. Take breast cancer as an example, infrared examination, which is used in many places, is actually meaningless for early diagnosis of breast cancer. Myth 3: Lung cancer can be detected by chest X-ray. If no problem is found in chest X-ray, does it mean that there is no lung cancer? The answer is no. Chest X-ray can only be used as a primary screening for lung tumor, and it is not accurate to rely on X-ray alone for diagnosis. Patients with positive initial screening must undergo CT scan of the chest. If the diagnosis of lung cancer is made by chest X-ray examination, the clinical stage is already advanced. Myth 4: The more items the better Some tumor screening items have potential pathogenic risk to human body, which requires oncology professional doctors to make a choice according to the specific conditions of the patient. Myth 5: Normal gynecological examination = no gynecological tumor Routine gynecological examination is not the only standard to measure the health of reproductive system. A normal gynecological examination does not mean that everything is fine. In clinical practice, we often see people with normal checkups suffering from gynecological tumors soon afterwards. Many gynecological tumors are asymptomatic in early stage, for example, ovarian cancer, although the incidence rate is high, patients will not feel obvious symptoms in stage I and II, therefore, it is difficult to screen out tumors simply by general gynecological examination. Myth 6: Gastroscopy is not needed if there are no symptoms In China, the incidence of gastrointestinal cancer is high. However, the vast majority of units and individuals do not include gastroscopy and colonoscopy into their medical checkup programs. Because the operation of gastroscopy and colonoscopy can be somewhat uncomfortable, which scares off many medical examiners. Some other people take a chance, thinking that if they have no symptoms, they will not suffer from gastrointestinal tumors. Therefore, those who agree to have gastroscopy almost have symptoms such as diarrhea, abdominal pain and blood in stool. There are almost no people who voluntarily ask for the above examination items. In fact, early colorectal cancer often has no clinical symptoms, and sometimes symptoms such as chronic diarrhea, abdominal pain and wasting are often treated as ordinary diarrhea, which delays early diagnosis and treatment. Myth 7: Tumors are the business of the elderly Many tumors are getting younger and younger, so screening is never the sole preserve of the elderly. At the same time, the older the tumor, the more important it is to be checked. As prostate cancer progresses very slowly in the elderly, even if they get the disease, most of them will not be life-threatening, so there is no need to have annual prostate cancer screening after the age of 75. Myth #8: Not being prepared for a physical examination Usually the results of several tests need to be combined. If the test results are affected by unpreparedness, it may result in a missed or misdiagnosis. When screening for cervical cancer, it should be noted that one or two days before the examination, sexual intercourse is not recommended; 3 days before colonoscopy, it is better to eat a dregs-free or less dregs semi-liquid diet. Myth 9: Normal tumor markers = no tumor Most people over 40 years old will choose to test tumor markers for medical checkups. Most of them will think that tumor markers can directly detect tumors, and if the results of tumor markers are within the normal range, it means there is no tumor in the body. However, it is not known that various clinical tumor markers can only be used as one of the auxiliary diagnostic indicators of tumors, and the clinical diagnosis cannot be determined by the tumor marker test results alone. Indeed, many tumors, especially when cancer occurs, the test results of tumor markers may be significantly higher than normal, for example: prostate cancer with PSA, liver cancer with AFP, etc. This is a cancer indicator with strong specificity, which can reflect the existence of cancer to a certain extent, but for some cancers with less specificity, such as: lung cancer, stomach cancer, intestinal tumor, etc., often when the tumor marker test results show However, for some less specific cancers, such as lung cancer, gastric cancer, intestinal tumor, etc., when the tumor marker test results show normal, it is possible that the cancer is already present.