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Congenital clubfoot

The foot turns in and down, the sole faces the other leg, the heel is drawn up and the outer border is arched: that is clubfoot, one of the commonest…

Congenital heart disease

In roughly one child in a hundred the heart forms differently from the usual pattern. It is the commonest of all birth defects, and the general name covers…

Conjunctivitis

The conjunctiva is the thin transparent film covering the white of the eye and the inside of the eyelids.

Constipation

Constipation is not a one-line diagnosis but a change in the way your bowel normally works: you go less often, the stool becomes hard, and passing it takes…

Contact dermatitis

Contact dermatitis is inflammation of the skin exactly where it has met a particular substance.

Corns and calluses

Corns and calluses are thickenings of the skin that form where there is sustained pressure or friction. They are not a disease: they are a protective mechanism.

Coronary heart disease

Coronary heart disease, also called ischaemic heart disease, is the state in which the heart muscle no longer gets enough blood because the arteries feeding…

Corticobasal degeneration

This is a rare brain disease that starts almost without warning and nearly always on one side: first a hand stops obeying, and a year or two later the trouble…

Costochondritis

The ribs are joined to the breastbone by cartilage rather than bone, and that joint can become inflamed.

COVID-19

The illness that once brought cities to a halt has long since become one more winter infection, and in most people it runs like a heavy cold.

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