gastrointestinal system cancer +
mouth disease +

burning mouth syndrome
esophageal cancer +
gastroesophageal cancer +
gastrointestinal carcinoma
gastrointestinal lymphoma
gastrointestinal neuroendocrine tumor
gastrointestinal stromal tumor
hepatobiliary system cancer +
herpangina +
intestinal cancer +
lip disease +
oral candidiasis
oral cavity carcinoma in situ +
oral hairy leukoplakia
oral leukoedema
oral mucosa leukoplakia
oral submucous fibrosis
oral tuberculosis
periodontal disease +
pharynx cancer +
salivary gland disease +
stomach cancer +
tongue disease +
tooth disease +
Trichomonas tenax trichomoniasis

cheek mucosa cancer
gum cancer +
hard palate cancer
lip cancer +
oral rhabdomyosarcoma
oral squamous cell carcinoma
retromolar area cancer
salivary gland cancer +
soft palate cancer +
tongue cancer +
vestibule of mouth cancer