Cancer detection refers to examinations conducted before the appearance of suspected symptoms with a view to making a prompt diagnosis of cancer. Cancer screening refers to the carrying out of these examinations in a systematic manner In order to identify cancer patients among people who are not showing any symptoms of cancer.

Cancer screening
Through systematic way to detect people without cancer symptoms, that is, to find out people with cancer among people without cancer symptoms.

Early detection
Refers to the relevant examination before the body appears suspicious symptoms, in order to diagnose cancer early.

• Early detection of cancer can help improve treatment effectiveness;
• To deal with earlier cancers, milder therapies can be used to reduce side effects.

• There are a few cancers that grow very slowly, and elderly patients may not develop disease during their lifetime. Therefore, the discovery of early cancerous through census may only bring unnecessary treatment side effects and psychological burden (such as some prostate cancer);
• If the initial test result is positive, this can only mean that the chance of cancer is high, and further examinations, including biopsy, are required to do so;
• If the test results do not reveal any abnormalities, the person must be falsely alarmed and suffer physically and mentally (called a false positive). On the other hand, if unfortunately you do have cancer, but the initial test result is normal (called a false negative) and you do not follow up, you may delay the treatment and affect the chance of successful treatment.