Cancer prevention medical examination is a professional medical examination method, which is different from the general health checkup. It is a professional examination method through oncology professionals to examine the whole body of the examinees through professional technical means and methods, with the purpose of detecting early tumors or obtaining the high-risk factors of the examinees, so as to prevent the occurrence of tumors. Through physical examination, many pre-cancerous diseases can be detected, such as severe cervical erosion, acromegaly infection, cystic hyperplasia of breast, etc., which should be actively treated or closely followed up, and do not think that you can rest on your laurels because it is not cancer. Regular cancer checkups mainly include the following items: routine items, endoscopy for biopsy if necessary, imaging diagnosis, and tumor-related serum marker testing. Routine items: 1.Three routine items: routine physical examination, routine laboratory examination and routine imaging examination. 2.Fecal occult blood (need to fast from occult blood diet). 3.Anal finger examination (DRE): can detect 75% of low rectal cancer and prostate lesions. 4.Exfoliative cytology examination: sputum cytology. 5.Frontal and lateral chest plain film and abdominal plain film. 6.Abdominal and pelvic ultrasound and some intracavitary ultrasound, etc. Endoscopy: endoscopy is an important tool for tumor diagnosis, which can be used for cavity organ and body cavity examination, and can detect precancerous lesions of mucosa and carcinoma in situ. Endoscopy can detect tumors that cannot be detected by X-ray and CT, and can be biopsied. Diagnostic imaging: 1, Gastrointestinal tract imaging, urography. 2, Electronic computerized X-ray body scan (CT). 3, Magnetic resonance imaging (MRI). 4, Arteriography, etc. 5, FCT, US guided puncture biopsy. 6, Nuclear scan: E&CT. 7, Positron nuclear imaging & PET, etc. Among them, PET/CT can both characterize and localize the lesion accurately. Its sensitivity, specificity and accuracy are higher than CT and MRI, which can detect tiny occult lesions, differentiate benign and malignant and estimate malignancy, and identify whether the tumor is a spot formation or recurrent foci after treatment. Tumor marker test: Tumor markers are a kind of substances that reflect the existence and growth of tumor produced by tumor cells themselves or produced by the body in response to tumor cells during the process of tumor occurrence and proliferation. Recommendations for common tumor screening Breast cancer: For women aged 20 to 39, it is recommended to have a physical examination (palpation) by a doctor every 1 to 3 years. for women aged 40 and above, it is recommended to have a mammography examination of the breast once a year along with a physical examination by a doctor. For those women with high-risk factors, such as family history of cancer, previous history of breast cancer, etc., it is recommended that you discuss with your oncologist the pros and cons of having mammography early and when to start, and have other related tests (such as ultrasound or MRI) or increase the frequency of tests. Lung cancer: Since the 1990s, low-dose spiral CT has been used internationally to screen for early-stage lung cancer. After years of international clinical trial data, this method has been proven to be the best means to detect early stage lung cancer. The key screening groups include people who are 45 years old or older, or have a long-term smoking history with a smoking index of 20 pack-years or more (number of years of smoking; number of packs smoked per day), or work in a confined environment for a long time, or work in an environment with a lot of dust particles for a long time, or have a family history. The Chinese Academy of Medical Sciences Cancer Hospital does not recommend the use of chest X-ray for early screening of lung cancer. Colorectal cancer: The recommended age for colorectal cancer screening starts from 50 years old, and the subject, regardless of gender, should follow 1 of the following screening methods: Colonoscopy once every 10 years. Fecal Occult Blood Test (FOBT) 1 fecal occult blood test or immunohistochemical test of the stool every year. Sigmoidoscopy performed every 5 years. Fecal occult blood test or immunohistochemical test (performed once a year) and sigmoidoscopy (performed once every 5 years) Performing both tests together is better than performing only 1 of these tests. Gastric, cardia, and esophageal cancers: Upper gastrointestinal imaging is recommended once every 2 years. Gastroscopy is recommended for those with the following high-risk factors (once a year) diagnosed long-standing gastric ulcer, patients with long-term chronic atrophic gastritis, patients with atypical hyperplasia detected by gastroscopy, and patients with long-term follow-up. Follow-up gastroscopy is recommended for all subjects with positive upper gastrointestinal imaging results. Cervical cancer: screening for cervical cancer should be started 3 years after first intercourse with 1 cervical smear (TCT) and pelvic examination per year. After the age of 30 years, those who have undergone 3 or more consecutive examinations based on risk factors and have negative results may choose to be screened less frequently. Prostate cancer: Men are recommended to be screened for prostate cancer starting at age 50. Those 50 years of age and older should have an annual finger check and prostate-specific antigen (PSA) test by a medical professional. For those with a family history of prostate cancer, start these tests at age 45. Liver cancer: For high-risk groups, it is recommended to have an ultrasound examination once a year and, if necessary, a liver-enhanced CT examination. High-risk groups include long-term heavy drinkers, chronic hepatitis B patients, patients with cirrhosis of the liver, and those who work with chemicals for a long time.