Ключевые слова: abdomen, acid, anatomy, body, burn, care, chest, digestion, digestive, disease, disorder, distress, duodenum, esophageal, esophagus, gastric, gastroesophageal, gerd, health, healthy, heartburn, hiatal, hiatus, human, illness, illustration, indigestion, lower, mechanism, medical, medicine, mesh, organ, pain, reflux, science, scientific, sensation, sick, sickness, sphincter, stomach, stress, surgery, system, valve,