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Dysphagia (odynophagia (caustic ingestion, drug-induced (NSAIDs, KCl,…

- - - - systemic sclerosis
      - achalasia
    - - diffuse esophageal spasm (DES)
  - - - esophageal web
      - esophageal cancer
      - peptic stricture (GERD)
      - caustic ingestion causing stricture (hot tea)
    - - foreign body
    - - 4 Ts (thyroid, thymoma/MG, lymphoma)
      - lung cancer