Dark stool and abdominal pain are not necessarily related to intestinal cancer. It is because black stool and abdominal pain are mainly caused by upper gastrointestinal diseases, such as bleeding gastric ulcer and stomach cancer. In order to understand the specific situation, it is recommended to go to the gastroenterology department for gastroscopy as well as colonoscopy to know specifically which disease it is, so that the treatment can be targeted. If it is a tumor, pathological examination should also be taken at the site of the tumor to know specifically which type of tumor it is before carrying out targeted treatment such as surgery, radiotherapy and chemotherapy treatment.