Symptoms

One of my eyelids is droopy

One of my eyes is very painful

One of my testicles is missing

One or both arms painful

One or both arms swollen

One or both breasts feel cold

One or both breasts numb

One or both hands affected

One or both hips affected

One-eye affected only

One-sided body atrophy

One-sided body weakness

One-sided facial atrophy

One-sided facial muscle spasms

One-sided facial paralysis

One-sided facial symptoms

One-sided headache

One-sided muscle weakness

One-sided numbness

One-sided paralysis

One-sided swollen parotid salivary gland

One-sided vaginal entrance swelling

One-sided vaginal pain

One-sided weakness

Onion bulb formation

Onset

Onset may be sudden or over years

Onset of symptoms 6 months to 2 years

Onset of symptoms after 16

Onset of symptoms ages 4-14

Onychauxis

Onychogryphosis

Onychogryphosis of fingernail

Onychogryphosis of toenails

Onychoheterotopia

Onycholysis

Onycholysis of distal fingernails

Onycholysis of fingernails

Onychomadesis

Onychomycosis

Onychotillomania

Oocyte maturation arrest

Oophoritis

Oozing sores

Opacification of the corneal epithelium

Opacification of the corneal stroma

Opacified paranasal sinuses

Opaque fingernails

Opaque vision

Open angle glaucoma

Open bite

Open comedo

Open fracture

Open mouth

Open mouthed breathing

Open neural tube defect

Open operculum

Open sores (ulcerations)

Open wounds

Ophthalmic artery hypoperfusion

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