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