Digestive 
Blood
Cardiovascular
Dermatology
Genitourinary,
Hormones
Infections
Oncology and
Musculo-skeletal
Mental health and
Parasites
Respiratory
Senses
Various
In leukaemia large amounts of white blood cells called blasts are produced, which outlast healthy cells and move around.
As time passes, there are more and more blasts than healthy cells and the blood cannot perform its function.
This causes problems such as infection, bleeding and anaemia.
