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Aplastic anaemia

Aplastic anaemia is a serious condition affecting the blood, where the bone marrow and stem cells do not produce enough blood cells. It is also called bone marrow failure and can happen suddenly (acute) or develop over a period of time (chronic). This page explains about aplastic anaemia, how it is treated and what to expect when a child comes to Great Ormond Street Hospital (GOSH) for treatment. 


Arrhythmias are abnormal heart rhythms, which can prevent the heart pumping efficiently. This page from Great Ormond Street Hospital (GOSH) explains how the heart beats normally, what happens when it starts to beat abnormally and how it can be treated.


Arthritis is a painful condition that affects the joints and bones. The tissue lining the joints, like elbows and knuckles, becomes inflamed, making them stiff and swollen.


Asthma is a condition that affects the small airways of the lungs (bronchi), making them red, swollen and sensitive. These sensitive or hyper-responsive airways can react badly to certain ‘triggers’ such as catching a cold, exercise, cigarette smoke, house dust mites, pets and pollen.