1. OAB, also known asOveractive bladder)
  2. Obesity
  3. Obesity, childhood, also known asChildhood obesity)
  4. Obsessive-compulsive disorder (OCD)
  5. Obstetric cholestasis, also known asCholestasis of pregnancy)
  6. Obstructive sleep apnea
  7. Obstructive sleep apnea in children, also known asPediatric obstructive sleep apnea)
  8. Occupational asthma
  9. OCD, also known asObsessive-compulsive disorder (OCD))
  10. Ocular albinism, also known asAlbinism)
  11. Ocular melanoma, also known asEye melanoma)
  12. Ocular rosacea
  13. Oculocutaneous albinism, also known asAlbinism)
  14. Oculosympathetic palsy, also known asHorner syndrome)
  15. ODD, also known asOppositional defiant disorder (ODD))
  16. Odontogenic tumors and cysts, also known asJaw tumors and cysts)
  17. OHSS, also known asOvarian hyperstimulation syndrome)
  18. Olfactory neuroblastoma, also known asEsthesioneuroblastoma)
  19. Oligodendroglioma
  20. Onychomycosis, also known asNail fungus)
  21. Oppositional defiant disorder (ODD)
  22. Optic neuritis
  23. Oral cancer, also known asMouth cancer)
  24. Oral candidiasis, also known asOral thrush)
  25. Oral lichen planus
  26. Oral thrush
  27. Orchitis
  28. Orthostatic hypotension (postural hypotension)
  29. Osgood-Schlatter disease
  30. Osteoarthritis
  31. Osteoarthritis, cervical, also known asCervical spondylosis)
  32. Osteochondritis dissecans
  33. Osteogenic sarcoma, also known asOsteosarcoma)
  34. Osteomalacia
  35. Osteomyelitis
  36. Osteonecrosis, also known asAvascular necrosis)
  37. Osteophytes, also known asBone spurs)
  38. Osteoporosis
  39. Osteosarcoma
  40. Otitis externa, also known asSwimmer's ear)
  41. Otitis media, also known asEar infection (middle ear))
  42. Outer ear infection, also known asSwimmer's ear)
  43. Ovarian cancer
  44. Ovarian cysts
  45. Ovarian hyperstimulation syndrome
  46. Overactive bladder
  47. Overactive thyroid, also known asHyperthyroidism (overactive thyroid))
  48. Oxyphil cell carcinoma, also known asHurthle cell cancer)
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