Stomach cancer, also known as gastric cancer, is a malignancy that develops in the lining of the stomach. It is a relatively uncommon but serious form of cancer that often presents at advanced stages, making treatment more challenging. Risk factors for stomach cancer include infection with Helicobacter pylori bacteria, chronic gastritis, smoking, a family history of stomach cancer, and certain dietary factors, such as a diet high in smoked, pickled, or salted foods. Symptoms may include abdominal pain, unintentional weight loss, nausea, and changes in appetite. Diagnosis involves endoscopic examinations, imaging tests, and biopsy confirmation. Treatment options vary based on the cancer's stage and may include surgery, chemotherapy, radiation therapy, or targeted therapies. Prognosis for stomach cancer is often less favorable due to late-stage diagnoses, emphasizing the importance of regular medical check-ups, awareness of risk factors, and early intervention for any concerning symptoms.