Symptoms

Ophthalmic artery occlusion

Ophthalmoparesis

Ophthalmoplegia

Opisthotonus

Oppenheim reflex

Opportunistic bacterial infection

Opportunistic fungal infection

Opportunistic infection

Opportunistic infections

Opportunistic viral infection

Opposable triphalangeal thumb

Oppositional defiant disorder

Opsoclonus

Optic ataxia

Optic atrophy

Optic atrophy from cranial nerve compression

Optic disc coloboma

Optic disc drusen

Optic disc hemorrhage

Optic disc hypoplasia

Optic disc pallor

Optic disc swelling in children

Optic nerve aplasia

Optic nerve arteriovenous malformation

Optic nerve compression

Optic nerve dysplasia

Optic nerve glioma

Optic nerve gray crescent

Optic nerve hypoplasia

Optic nerve mass

Optic nerve misrouting

Optic nerve problem

Optic nerve sheath dilatation

Optic nerve sheath meningioma

Optic nerve tram-track sign

Optic neuritis

Optic neuropathy

Optic pit

Optically empty vitreous

Opto-chiasmatic atrophy

Oral aversion

Oral bleeding

Oral blisters

Oral bruise

Oral candida

Oral cavity bleeding

Oral cavity telangiectasia

Oral discomfort

Oral erythroplakia

Oral hairy leukoplakia

Oral infection

Oral leukoplakia

Oral lichenoid lesion

Oral melanoacanthoma

Oral melanotic macule

Oral membrane ulcers

Oral motor hypotonia

Oral mucosa nodule

Oral mucosa plaque

Oral mucosal blisters

Oral mucosal papule

Oral pain on eating

Oral pain when speaking

Oral problem

Oral red patches

Oral synechia

Oral ulcer

Oral white patches

Oral-pharyngeal dysphagia

Orange

Orange colored skin

Orange colored urine

Orange discolored tonsils

Orange stool

Orange urine

Orange-brown nail patches in children

Orangeness

Orangish urine

Orbital cleft

Orbital craniosynostosis

Orbital cyst

Orbital inflammation

Orbital rhabdomyosarcoma

Orbital schwannoma

Orchitis

Orchititis

Organ abscess

Organ abscesses

Organ problem

Organic aciduria

Organized thrombi within interlobular vein lumen

Organizing pneumonia

Orgasm

Ornithinuria

Orofacial action-specific dystonia induced by speech

Orofacial cleft

Orofacial dyskinesia

Oromandibular dystonia

Oromotor apraxia

Oropharyngeal squamous cell carcinoma