There is no way to determine whether diarrhea is caused by cancer through diarrhea symptoms. There are many causes of diarrhea, including indigestion, food poisoning, intestinal inflammation, intestinal inflammatory infections, and medication diarrhea. 1. Indigestion: Indigestion will cause a lot of food residue to be stored in the large intestine, thus causing diarrhea. 2. Food poisoning: Intestinal inflammation: Bacterial infections cause intestinal inflammation, which can also cause diarrhea symptoms. If you ingest food contaminated with Staphylococcus aureus toxins, arsenic, lead, mercury and other heavy metals, you will experience gastrointestinal symptoms such as vomiting and diarrhea, often accompanied by flushing, headache, palpitations and other manifestations. 3. Pharmacological diarrhea: some drugs on the intestinal motor nerve irritation, causing secondary infection or intestinal inflammation, such as: neomycin, lincomycin and other drugs, the human body will also appear diarrhea symptoms. 4. Intestinal infections: such as rotavirus, salmonella and other infections, patients in the diarrhea is often accompanied by vomiting, abdominal cramps, bloody stools and fever. When diarrhea occurs, you should go to the hospital at the first time to determine whether the diarrhea is caused by cancer or not, which needs to be judged by systematic examination, such as: gastroenteroscopy, imaging examination and so on. Under the guidance of professional doctors, the cause of the disease should be clarified and appropriate treatment should be received as soon as possible to ensure that the condition will not further deteriorate.