TOPICS: Esophageal web, dysphagia for solids, esophageal squamous cell carcinoma, plummer vinson syndrome, severe iron deficiency anemia, glossitis, zenker diverticulum, false diverticulum, pharyngeal mucosa, upper esophageal sphincter, pharyngoesophageal junction, dysphagia, cough, regurgitation, halitosis, mallory weiss syndrome, severe vomiting, alcoholism, bulimia, painful hematemesis, boerhaave syndrome, esophageal rupture, pneumomediastinum, subcutaneous emphysema, achalasia, lower esophageal sphincter, inhibitory neurons, myenteric plexus, Auerbach's plexus, chagas disease, extraesophageal malignancies, progressive dysphagia, halitosis, esophageal manometry, bird beak sign, barium swallow study, gerd, reflux, alcohol, tobacco, obesity, fat-rich diet, caffeine, hiatal hernia, heartburn, regurgitation, chronic cough, hoarseness, tooth enamel, adult onset asthma, ulceration with structures, barrett esophagus, intestinal metaplasia, goblet cells, esophageal dysplasia, adenocarcinoma, esophageal carcinoma, adenocarcinoma, america, obesity, smoking, achalasia, lower one third of esophagus, squamous cell carcinoma, worldwide, hot liquids, upper two thirds of esophagus, progressive dysphagia, weight loss, hematemesis, hoarseness, cough, lymph node, cervical nodes, mediastinal or tracheobronchial nodes, celiac or gastric nodes