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Anal cancer

This is an uncommon tumour, accounting for roughly one or two per cent of all malignant tumours of the bowel.

Anal fissure

This is a narrow tear in the skin of the anus, no bigger than a paper cut, yet the pain it causes is in a class of its own.

Anal fistula

An anal fistula is a narrow tunnel joining the inside of the anus to the skin beside it. Infection lives inside it, so pus leaks from the outer opening from…

Anaphylaxis

Anaphylaxis is the most severe form of allergic reaction. It develops within minutes and involves not just the skin but the whole body: the airways swell and…

Androgen insensitivity syndrome

The hormone is made, there is plenty of it in the blood, and the cells still fail to answer. That, in short, is androgen insensitivity syndrome.

Andropause (age-related testosterone deficiency)

Andropause, or the "male menopause", is the name usually given to the cluster of complaints men bring to the doctor once past forty: desire has gone…

Angelman syndrome

A child who laughs a great deal and easily, is drawn to water, barely speaks and is late to walk: out of these seemingly unrelated traits comes the…

Angina

Angina is tightness or pain in the chest that appears when the heart muscle is short of blood.

Angioedema

Angioedema is rapid swelling in the deep layers of the skin and the mucous membranes: fluid leaves the vessels and collects in the surrounding tissue.

Animal and human bites

A bite wound is deceptive: from the outside it is a couple of tooth marks that stop bleeding within a minute, but a tooth works like a needle.

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