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