Conditions beginning with the letter O
- OAB (Overactive Bladder)
- 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 (Toenail Fungus)
- Oral Cancers (Mouth Cancers, Cancer of the Mouth)
- Oral Herpes (Cold Sores, Fever Blister)
- Oral Thrush
- Organic Brain Syndrome (Dementia, Chronic Brain Syndrome, Senile Dementia)
- Orthostatic Hypotension (Low Blood Pressure, Hypotension)
- Osteitis deformans (Paget's Disease)
- Osteoarthritis (Degenerative Joint Disease)
- Osteomalacia (Rickets, Soft Bones)
- Osteomyelitis (Bone Infection, Hematogenous Osteomyelitis)
- Osteoporosis
- Otitis Externa (Outer Ear Infection, Ear Infection, Swimmer's Ear)
- Otitis Media (Earache, Ear infection, Middle Ear Infection)
- Outer Ear Infection (Otitis Externa, Ear Infection, Swimmer's Ear)
- Ovarian Cancer
- Ovarian Cycle Syndrome (Premenstrual Syndrome, Premenstrual Tension, PMS)
- Overactive Bladder (OAB)
- Overactive Thyroid (Hyperthyroidism, High Thyroid, Thyroid Disorders)
- Overweight (Obesity, Unhealthy Weight)
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