Multiple primary neoplasms are relatively rare, but their incidence has increased because of aging and improvements in diagnostic imaging. There are many ways to classify, but nowadays, multiple primary cancers are again classified as synchronous and metachronous, the time is 6 months after the first primary injury detection, some authors get 12 months.
Our clinical case is a 66-year-old man, prolonged exposure to risk factors for cancer. The patient was diagnosed with different types of primary cancer, colon cancer, thyroid cancer, lung cancer, and stomach cancer. The patient was treated according to the general clinical guidelines suitable for the disease type and the stage of the disease at the time of detection. Lesson learned is the importance of screening tests, attitudes, and comprehensive views of doctors for cancer patients, avoiding missing injuries, affecting the quality of treatment for patients.