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