Gastric adenocarcinoma is a type of cancer that originates in the lining of the stomach. It is the most common form of stomach cancer and can develop from pre-existing conditions such as chronic gastritis or gastric ulcers. Symptoms may include abdominal pain, weight loss, and difficulty swallowing. Risk factors for gastric adenocarcinoma include Helicobacter pylori infection, smoking, and a diet high in salty or smoked foods. Early detection is crucial for effective treatment, which may involve surgery, chemotherapy, or radiation therapy. Regular medical check-ups can help identify potential issues early on.