Editing List of diseases (O) (section)

==Or==
{| class="toc"
| style="padding:0.5em" | {{hlist|[[#Ora–Orn|Ora–Orn]] | [[#Oro–Ort|Oro–Ort]]}}
|}
===Ora–Orn===
* [[Oral facial digital syndrome type 3]]
* [[Oral facial digital syndrome type 4]]
* [[Oral facial digital syndrome]]
* [[Oral facial dyskinesia]]
* [[Oral leukoplakia]]
* [[Oral lichen planus]]
* [[Oral lichenoid lesions]]
* [[Oral squamous cell carcinoma]]
* [[Oral submucous fibrosis]]
* [[Oral-facial cleft]]
* [[Oral-facial-digital syndrome, type IV]]
* [[Oral-facial-digital syndrome]]
* [[Oral-pharyngeal disorders]]
* [[Organic brain syndrome]]
* [[Organic mood syndrome]]
* [[Organic personality syndrome]]
* [[Organophosphate poisoning]]
* [[Ornithine aminotransferase deficiency]]
* [[Ornithine carbamoyl phosphate deficiency]]
* [[Ornithine transcarbamylase deficiency, hyperammonemia due to]]
* [[Ornithinemia]]
* [[Ornithosis]]

===Oro–Ort===
* [[Oro acral syndrome]]
* [[Orofaciodigital syndrome Gabrielli type]]
* [[Orofaciodigital syndrome Shashi type]]
* [[Orofaciodigital syndrome Thurston type]]
* [[Orofaciodigital syndrome type 2]]
* [[Orofaciodigital syndrome type1]]
* [[Orotic aciduria hereditary]]
* [[Orotic aciduria purines-pyrimidines]]
* [[Orotidylic decarboxylase deficiency]]
* [[Orstavik Lindemann Solberg syndrome]]
* [[Orthostatic intolerance]]