Herbal medicines do not cause an increase in carcinoembryonic antigen (CEA). Carcinoembryonic antigen (CEA) is an important indicator for screening and monitoring of cancers such as breast cancer and pancreatic cancer, which may decrease during treatment if the disease is under control. Under normal circumstances, the use of traditional Chinese medicine will not lead to an increase in carcinoembryonic antigen. If the tumor progresses or recurs, the carcinoembryonic antigen will continue to increase, but there is no direct relationship with traditional Chinese medicine. Chinese medicine is generally used as an adjuvant treatment for cancer, and radiotherapy, chemotherapy and targeted therapy should be carried out under the guidance of doctors during the period of taking the medicine. Carcinoembryonic antigen is not related to traditional Chinese medicine, and it is recommended that patients go to regular hospitals for consultation and clarification of the cause, so as to avoid delaying the condition.