Mr. Chen, who is in his 50s, was diagnosed with “esophageal cancer” a year ago and recovered well after treatment at a local hospital, but was diagnosed with both “lung cancer” and “rectal cancer” at the end of April this year. But at the end of April this year, he was diagnosed with both “lung cancer” and “rectal cancer”. After determining that it was not a metastatic lesion, Mr. Chen underwent “lung cancer resection” and “radical rectal cancer surgery” in Nanjing, and was discharged from the hospital on the 23rd in stable condition after surgery. Mr. Chen was puzzled how he could have 3 types of cancer in his body? Dr. Jiang Chunping, chief physician of general surgery of Gulou Hospital, said that the patient actually had “repeated cancer”. Unlike the usual metastasis and recurrence of cancer, “recurrent cancer” refers to the occurrence of two or more unrelated primary malignant tumors at the same time or one after another. The occurrence of “recurrent cancer” is due to the long latent period of tumor development, and the stimulation of tumor development by various internal and external factors can take a long time to appear, so that malignant tumors of different types and nature may manifest at the same time or at different times. It is generally believed that the factors leading to “repeat cancer” may include genetic factors, endocrine factors, genetic mutations, long-term use of immunosuppressive drugs and poor lifestyle, such as smoking, alcoholism, excessive fat intake and low fiber intake. Experts say that the chance of tumor patients suffering from “repeat cancer” is 11 times higher than that of normal people. In the prognosis follow-up of malignant tumor patients, if new lesions appear, apart from considering metastasis recurrence, the possibility of “repeat cancer” should be considered to prevent missing or misdiagnosis. Therefore, good living habits and regular medical checkups and follow-ups are important means to prevent “repeat cancer”.