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Long-sightedness

Long-sightedness is a way the eye can be built: distance is clearer than close up. It also goes by the names hypermetropia and hyperopia.

Low blood pressure (hypotension)

A reading below 90/60 mmHg is conventionally called low blood pressure. Unlike high pressure, though, low pressure is not in itself a disease: a great many…

Low blood sugar (hypoglycaemia)

Hypoglycaemia means blood glucose has dropped below 4 mmol/L. Nearly always it happens to people treating diabetes with insulin or with tablets that push the…

Low sperm count

A low sperm count is a common reason for difficulty conceiving. It does not mean infertility: many men with reduced counts become fathers, including without…

Low white blood cell count

White blood cells are the cells that recognise microbes and destroy them. When they are scarce, infections take hold more easily, run a rougher course and…

Lower respiratory tract infection

This is the name for infections of the airways and the lungs, the thing usually called a chest infection.

Lung cancer

Lung cancer is one of the commonest malignant tumours and the leading cause of cancer death worldwide.

Lupus

When people say lupus they nearly always mean systemic lupus erythematosus, a disease in which the body's defence system stops telling its own tissues from…

Lyme disease

Lyme disease is an infection caused by bacteria of the Borrelia group and carried by ticks of the Ixodes group. It does not pass from person to person.

Lymphoedema

Lymphoedema is persistent swelling that appears when the lymphatic system can no longer keep up with draining fluid away from the tissues.

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