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Macular hole

A macular hole is a full-thickness defect right at the centre of the retina, in the very spot we use to read, recognise faces and pick out fine detail.

Malaria

Malaria is a parasitic disease passed on by mosquitoes in the tropics and subtropics. A single bite is enough.

Malignant brain tumour (brain cancer)

The skull is a closed box of fixed volume, and anything extra growing inside it sooner or later gets in the way.

Mallet finger

A ball catches the tip of the finger, or the finger snags on a bedsheet or on a sock while getting dressed, and from that moment the last bone of the finger…

Malnutrition (undernutrition)

This is not only about hunger or poverty, although it is about those too. Far more often a person is eating and still getting less than the body needs…

Marfan syndrome

Connective tissue is what holds the body together from the inside: the walls of arteries, the ligaments of joints, the suspension of the lens in the eye, the…

Mastitis

Mastitis is inflammation of the breast tissue. It is met most often by women in the first months of breastfeeding: an area of the breast turns firm, hot and…

Mastocytosis

Mastocytosis is a rare condition in which too many mast cells build up in the tissues. The body needs these cells, but when there are too many they empty…

Mastoiditis

Mastoiditis is a pus-forming infection of the bone you can feel as a small lump just behind the ear.

Measles

Measles is a viral infection that spreads more easily than almost anything else people catch.

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