C16: Malignant neoplasm of stomach

A Malignant neoplasm of the stomach, also often referred to as stomach or gastric cancer, is a type of cancer that begins when cells in the stomach start to grow out of control. It can arise in any part of the stomach and from various types of tissues within the stomach. One common type is called adenocarcinoma, which starts from the tissue that lines the inside surface of the stomach. This group of conditions is mostly associated with long-lasting inflammation of the stomach, which can be caused by infection with a common bacterium (Helicobacter pylori) or certain chronic conditions like gastritis or ulcers. Common symptoms may include loss of appetite, weight loss without trying, abdominal or stomach pain, vague discomfort in the abdomen, usually above the navel, among others. Stomach cancer tends to progress in different stages and can affect nearby organs or spread to other parts of the body through the bloodstream or lymphatic system.