The term "digestive system tumours," commonly referred to as "gastrointestinal (GI) tumours," refers to a broad category of cancers that can develop in any area of the gastrointestinal tract, from the oesophagus to the rectum. These tumours develop when aberrant digestive system cells start to proliferate uncontrollably and form a mass or lump of tissue. Because they can cause serious health problems and, if untreated, can be fatal, GI tumours are a major global health concern. Colorectal cancer, which mostly impacts the colon and rectum, is one of the most prevalent types of GI tumours. Beginning as tiny, benign growths known as polyps, colorectal cancer frequently progresses over time to form malignant tumours. Regular screenings, such as colonoscopies, can greatly improve the likelihood of effective treatment and better results by allowing for early identification and intervention. The cancer of the stomach lining, known as gastric cancer, is another common type of GI tumour. A high-processed-food diet, smoking, Helicobacter pylori infection, and a family history of the disease are all risk factors for stomach cancer. Regular medical check-ups and screenings are essential for the early discovery and treatment of stomach cancer because early-stage cases may not show any symptoms. Another dangerous GI tumour is esophageal cancer, which affects the tube that connects the oesophagus to the stomach. It is frequently linked to risk factors such persistent acid reflux, use of tobacco and alcohol, obesity, and a diet lacking in fruits and vegetables. Chest pain, trouble swallowing, and unexplained weight loss are a few signs of esophageal cancer that should be promptly diagnosed and treated.It is impossible to overestimate the impact that gastrointestinal tumours have on patients and healthcare systems as a whole. In the fight against these powerful diseases, early detection, alterations to one's lifestyle to lower risk factors, and continued research into treatment alternatives are essential. For those who are impacted by GI tumours, advances in medical science continue to give hope for better outcomes and a better future.