Stomach disorders include gastritis, gastroesophageal reflux and peptic ulcers, according to Mayo Clinic and WebMD. Gastritis is an inflammation of the stomach lining. Gastroesophageal reflux is a condition in which the stomach acid chronically flows up into the esophagus. Peptic ulcers are open sores that develop inside the stomach.
Gastritis usually results from a bacterial infection, reports Mayo Clinic. Use of pain medications and drinking too much alcohol may also cause gastritis. Gastroesophageal reflux often happens when the lower esophageal sphincter muscle is too weak, states WebMD. This muscle lies at the junction between the esophagus and the stomach. Peptic ulcers are usually the result of a bacterial infection or medication use.