Oropharyngeal Candidiasis
Oropharyngeal candidiasis, also referred to as oral thrush, is a fungal infection of the oral cavity and pharynx, primarily caused by the opportunistic yeast Candida…
Ornithine Carbamoyltransferase Deficiency
Ornithine carbamoyltransferase deficiency (OTC deficiency) is a rare X-linked urea cycle disorder resulting from a mutation in the OTC gene, which encodes the mitochondrial enzyme…
Oral Ulcers Associated with Behçet’s Disease
Behçet’s disease is a rare, chronic, multisystemic inflammatory disorder characterized by recurrent oral ulcers, genital lesions, ocular inflammation, and systemic involvement. One of the earliest…
Oral Candidiasis
Oral candidiasis, commonly referred to as oral thrush, is a fungal infection in the oral cavity caused predominantly by Candida albicans. It manifests as white,…
Opisthorchiasis
Opisthorchiasis is a significant parasitic infection caused by trematodes, primarily Opisthorchis viverrini and Opisthorchis felineus. These liver flukes inhabit the bile ducts of humans and…
Opioid Use Disorder (OUD)
Opioid Use Disorder (OUD) is a chronic, relapsing medical condition characterized by the compulsive use of opioids despite harmful consequences. It involves both physical dependence…
Opioid Overdose
The global opioid crisis has emerged as a significant public health emergency. Opioid overdose, a leading cause of preventable death, results from the excessive consumption…
Ophthalmia Sympathetic
Ophthalmia sympathetic, medically termed sympathetic ophthalmia, is a rare but serious bilateral granulomatous uveitis that occurs after penetrating trauma or intraocular surgery in one eye.…
Ophthalmia Neonatorum
Ophthalmia neonatorum, also known as neonatal conjunctivitis, is a form of eye infection occurring within the first 28 days of life. It is characterized by…
Open-Angle Glaucoma
Open-angle glaucoma, also known as primary open-angle glaucoma (POAG), is a chronic, progressive optic neuropathy characterized by increased intraocular pressure (IOP) and subsequent damage to…