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Obesity

Obesity is not a cosmetic matter and not a failure of willpower. It is a state in which so much body fat has built up that it starts interfering with the…

Oesophageal atresia and tracheo-oesophageal fistula

This is a rare birth defect: the oesophagus never formed as a continuous tube. Its upper part ends in a blind pouch and does not join the stomach, while the…

Oesophageal cancer

The oesophagus is a muscular tube about twenty-five centimetres long that runs from the throat down to the stomach; the throat itself is a different organ…

Oral thrush (oral candidiasis)

The candida fungus lives in the mouth of roughly one healthy person in two and gives no sign of itself: saliva, the neighbouring bacteria and the immune…

Orf

Orf is a skin infection caught from sheep and goats. Medical notes call it contagious ecthyma or contagious pustular dermatitis, and people who work with…

Osteoarthritis

Osteoarthritis is the commonest joint disease. It develops slowly: the cartilage covering the ends of the bones loses its springiness and thins, the bone…

Osteomyelitis

Osteomyelitis is infection of the bone and the bone marrow. Bone looks impregnable, yet germs reach it by three routes: through the bloodstream, from a…

Osteophyte (bone spur)

An osteophyte is a hard bony projection that grows at the rim of a joint or at the edge of a vertebra.

Osteoporosis

In osteoporosis, bone loses density and internal scaffolding: from the outside it looks the same, but inside it comes to resemble a sponge with large holes.

Otosclerosis

Otosclerosis is abnormal bone growth in the middle and inner ear that locks one of the tiny hearing bones in place so it can no longer pass sound on.

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