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Stomach cancer, also known as gastric cancer, is a type of cancer that originates in the lining of the stomach. It is a relatively uncommon but serious form of cancer. Most stomach cancers are adenocarcinomas, which develop from the cells that form the innermost lining of the stomach.

The exact cause of stomach cancer is often unclear, but factors such as infection with Helicobacter pylori bacteria, long-term inflammation of the stomach (gastritis), smoking, a family history of stomach cancer, and certain dietary factors may increase the risk.

Symptoms of stomach cancer may include abdominal pain or discomfort, unintentional weight loss, loss of appetite, difficulty swallowing, and blood in the stool. Early stages of stomach cancer may not cause noticeable symptoms, making early detection challenging.

Treatment for stomach cancer typically involves surgery to remove the tumor, along with chemotherapy and/or radiation therapy. The specific approach depends on the stage of cancer, the location of the tumor, and the overall health of the patient. Prognosis varies, with early detection and treatment offering the best chances for a favorable outcome. Regular medical check-ups, especially for individuals with risk factors, can aid in early diagnosis and timely intervention.