Early symptoms of gastric, or stomach, cancer include indigestion, heartburn, loss of appetite, mild nausea and a bloated feeling after eating, according to WebMD. As the disease progresses, stomach pain, vomiting, blood in the stool, unexplained weight loss and trouble swallowing may occur.
Other symptoms of gastric cancer occur as tumors in the stomach grow, notes WebMD. These include stomach swelling, the development of a yellow tint to the skin or eyes, diarrhea and constipation. Tiredness, weakness and heartburn are additional symptoms.
Although the exact cause of gastric cancer is unknown, researchers believe that infection with H. pylori, a common bacteria that causes ulcers, is a risk factor for developing the disease, reports WebMD. Gastritis, polyps in the stomach and long-lasting anemia are also risk factors.