Diseases
ObesityObstructive sleep apnoea (OSA)
Oesophageal cancer
Oligomenorrhoea (Irregular or infrequent periods)
Oral sex (Infection risk)
Oral thrush
Orchitis and epididymitis
Orgasm problems (A guide for women)
Osler's disease (Hereditary haemorrhagic telangiectasis)
Osteoarthritis
Osteogenesis imperfecta (Brittle bone disease)
Osteomalacia and rickets (Vitamin D deficiency)
Osteoporosis
Osteoporosis (Preventing falls)
Osteoporosis (Treatment)
Otitis in the outer ear (Otitis externa)

