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- Obesity 133 total
- Obsessive-Compulsive Disorder 1 total
- Occlusions 16 total
- Ocular Hypertension 19 total
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- Oral Cancer 3 total
- Oral Candidiasis 1 total
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- Organ Transplant 17 total
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- Orthopedic Surgery 34 total
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- Orthostatic Hypotension 2 total
- Osteoarthritis 49 total
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- Osteopenia 6 total
- Osteoporosis 8 total
- Osteosarcoma 5 total
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- Otitis Media 1 total
- Ovarian Cancer 31 total
- Ovarian Cysts 3 total
- Ovarian Function 1 total
- Ovulation 6 total
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