Conditions beginning with the letter "O"
 | OA (Osteoarthritis, Degenerative Joint Disease) |
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| Obesity (Overweight, Unhealthy Weight, Weight Problem) |
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| Obsessive Compulsive Disorder (OCD) |
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| OCD (Obsessive Compulsive Disorder) |
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| Oesophageal Cancer (Esophageal Cancer, Cancer of the Esophagus) |
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| Oncological Pain (Cancer Pain) |
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| Onychomycosis (Fungal Skin or Nail Infections, Yeast Infection, Ringworm, Tinea) |
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| Oral Cancers (Mouth Cancers, Cancer of the Mouth) |
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| Oral Decay (Tooth Decay and Toothache, Cavities, Dental Caries) |
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| Oral Herpes (Cold Sores, Fever Blister) |
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| Oral Thrush (Candidiasis, Moniliasis, Yeast Infections) |
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| Organic Brain Syndrome (Dementia, Chronic Brain Syndrome, Senile Dementia) |
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| Osteitis deformans (Paget's Disease) |
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| Osteoarthritis (Degenerative Joint Disease, OA) |
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| Osteomalacia (Rickets, Soft Bones) |
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| Osteomyelitis (Bone Infection, Hematogenous Osteomyelitis) |
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| Osteoporosis |
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| Otitis Externa (Swimmer's Ear, Outer Ear Infection) |
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| Otitis Media (Earache, Ear Infection, Middle Ear Infection) |
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| Outer Ear Infection (Swimmer's Ear, Otitis Externa) |
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| Ovarian Cancer (Cancer of the Ovaries) |
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| Overactive Bladder |
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| Overactive Thyroid (Hyperthyroidism, High Thyroid, Thyroid Disorders) |
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| Overweight (Obesity, Unhealthy Weight, Weight Problem) |
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