In ALL, lymphoblast cells don’t mature properly and grow too fast. The abnormal lymphoblasts (also called leukaemia cells) build up in your bone marrow and eventually, there’s no room for normal blood cells to be made. The leukaemia cells may also spread to other parts of your body.

There are different types of ALL. The most common are B-cell ALL, T-cell ALL, and Philadelphia positive ALL.

Anyone can get ALL at any point in their life.  The treatments and outlook for children and adults with ALL are different.  This section covers what to expect for adults, but we also have information about childhood ALL.
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