In leukaemia, the leukocytes (white blood cells) which protect the body against the microbes increase uncontrollably. As a result of the uncontrolled increase of the leukocytes they cannot defend the body and cause malfunctioning of the other blood cells like the erythrocytes and trombocytes.

The reason of leukaemia is not yet fully known. That it is observed in maternal twins, people with Down syndrome and with fanconi anaemia, shows that genetic factors play a role in the disease. Also observance risk increases in people who are exposed to radiation and chemical materials.

In leukaemia, there are complaints of rapid tiredness, bleedings, malaise, loss of weight, bone pain, articular panicula. After the physical examination the lymph glands grow and the liver and the spleen grow. If there is infection shivering, fever and sweating are observed.

In leukaemia the treatment starts with chemotherapy. In some cases chemotherapy is supported with radiotherapy. Bone marrow transplantation is a method that may be applied to the patients after chemotherapy, and it is based on the principle of transmitting the healthy stem cells to the patient.