The symptoms of peritoneal cancer should be combined with the location of the primary cancer, and the symptoms are different, as follows: 1. Primary peritoneal cancer that originates from peritoneum, its symptoms are often atypical, especially in the early stage, but after its development to a certain extent, it can have abdominal distension, abdominal pain and ascites; 2. Metastatic peritoneal cancer, if it originates from colon cancer or rectal cancer metastasis to peritoneum, the symptoms should be combined with the performance of colon cancer and peritoneal cancer. If there is a history of surgery for colon cancer or rectal cancer, various tumor indicators will be elevated after surgery, and abdominal pain, abdominal distension and ascites will appear; 3. If stomach cancer metastasizes to the peritoneum, the symptoms will be combined with the performance of stomach cancer, such as upper abdominal pain, nausea, vomiting, wasting, abdominal distension and even ascites; 4. If ovarian cancer or cervical cancer from the ovaries metastasizes to the peritoneum, the performance will also be combined with ovarian cancer or cervical cancer. It can show abdominal distension, abdominal pain and large lump in the stomach, which are all manifestations of peritoneal cancer. In short, the symptoms of early peritoneal cancer are atypical, but in the middle and late stages, the main symptoms are abdominal distension, abdominal pain, emaciation, and even a lump can be felt in the abdomen, together with the manifestation of the original tumor.