Early cancer can be detected through regular medical checkups. Most cancers lack effective symptoms in the early stage, and it is difficult to diagnose in time through clinical manifestations. Normally, attention should be paid to regular medical checkups to be able to detect cancers at an early stage. 1. Common physical examination methods include color ultrasound, which can be performed on abdominal organs, such as liver, gallbladder, pancreas, spleen, kidney, urinary system, lymph nodes, thyroid gland, breast gland, etc., and can detect abnormal lumps at an early stage. 2. X-ray examination is mainly used for the judgment of tumors in bones and chest, etc. If necessary, high-resolution CT examination can be carried out, which can obviously improve the diagnosis rate of early tumors. 3. Endoscopy is mainly used for early screening of esophageal and gastrointestinal tumors. Through endoscopy, it can directly observe the lesions in the digestive system, which is conducive to early detection of tumors. 4. Blood test is mainly used for the examination of tumor markers, such as carcinoembryonic antigen, which can be used to assist in the diagnosis of tumor.