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Heart failure

Heart failure is the state in which the heart stops pumping as much blood as the body needs.

Heart rhythm problems (arrhythmia)

The heart runs on wiring of its own: it sets the rate and keeps the upper and lower chambers contracting in turn.

Heart valve disease

There are four valves inside the heart, and every one of them works like a one-way door: it opens, lets blood through and shuts tight so that none comes back.

Heartburn and acid reflux

The burning behind the breastbone that climbs towards the throat and leaves a sour taste in the mouth is familiar to almost everyone: a heavy supper, you lie…

Heat exhaustion and heatstroke

The body cools itself in two ways: by sending blood to the skin and by evaporating sweat. In hot weather both mechanisms run at full stretch, and sooner or…

Heat rash

Heat rash appears when the ducts of the sweat glands become blocked and sweat cannot reach the surface of the skin.

Heavy periods

How much blood is lost in a period is something a woman has nothing to compare with: nobody has seen anyone else's, so her own seems ordinary.

Henoch-Schönlein purpura (IgA vasculitis)

It nearly always starts the same way: within a few hours, dark red dots and blotches come up on the shins and buttocks, looking like small bruises or insect…

Hepatitis

Hepatitis is not one illness but a general word for inflammation of the liver. The causes differ: five viruses named after letters, alcohol, medicines and…

Hepatitis A

Hepatitis A has a worse name than it deserves. It is inflammation of the liver caused by a virus that travels on unwashed hands, in water and in food.

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