Health Encyclopedia: O A-Z 1 2 5 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Obesity Orthopedic services Obesity hypoventilation syndrome (OHS) Osgood-Schlatter disease Obesity in children Osmolality blood test Obsessive-compulsive disorder Osmolality urine test Obsessive-compulsive personality disorder Osmotic demyelination syndrome Obstructive sleep apnea - adults Osmotic diuresis Obstructive uropathy Osmotic fragility test Occupational asthma Osteitis fibrosa Occupational hearing loss Osteoarthritis Oil-based paint poisoning Osteogenesis imperfecta Oily hair Osteoid osteoma Oily skin Osteomalacia Oleander poisoning Osteomyelitis Omphalocele Osteomyelitis in children Omphalocele repair Osteonecrosis Open gallbladder removal Osteopenia - premature infants Open heart surgery Osteoporosis - overview Open lung biopsy Osteosarcoma Open pleural biopsy Osteotomy of the knee Ophthalmoscopy Ostomy - resources Opiate and opioid withdrawal Otitis Opioid intoxication Otitis media with effusion Opisthotonos Otosclerosis Oppositional defiant disorder Ovarian cancer Optic glioma Ovarian cysts Optic nerve atrophy Ovarian hyperstimulation syndrome Optic neuritis Ovarian overproduction of androgens Oral cancer Oven cleaner poisoning Oral human papillomavirus infection Over-the-counter medicines Oral hypoglycemics overdose Over-the-counter pain relievers Oral mucous cyst Overcoming breastfeeding problems Oral Tissue Biopsy Overdose Orbit CT scan Overweight Orbital cellulitis Ovulation home test Orbital pseudotumor Ovulation Induction Orchitis Oxalic acid poisoning Orgasmic dysfunction in women Oxazepam overdose Orofacial Pain Oxygen therapy in infants Oropharyngeal Cancer Ozena Oropharynx lesion biopsy