O

---

Obesity	Organic acidaemias
Occupational lung disease	Organophosphate exposure/poisoning
Oedema	Osteomalacia
Oesophagitis	Osteomyelitis
Oligomenorrhoea	Osteoporosis
Oliguria	Otitis externa
Opportunistic infections	Otitis media
Oral anticoagulant therapy	Ovarian hypofunction
Oral ulcers	Ovarian mass
Orchitis	Overdose, drug