At some people the two organs produce a lot of leukocytes that make the blood to have a whitish tinge.In that case the production of normal cells and the ability to fight infection decreases.

When the leukemic cells accumulate the production of oxygen-carrying red blood cells,blood-clotting cells and normal leukocytes lessen,which make the ability to fight infection lower.If this is not treated the leukemic cells can destroy the bone marrow,can enter in the bloodstream,and than can invade other parts of the body like the lymph nodes,spleen,liver,the brain and the spinal cord.

Four types of leukemia exist:acute,chronic,lymphocytic and myelogenous.There is a difference between acute and chronic leukemia because the acute leukemia progress very rapidly and the chronic leukemia progress slowly.The acute leukemia is frequently met at the children.

The leukemia has many symptoms but there are not the same to everyone.These are the symptoms:weakness or chronic fatigue,fever of unknown origin,weight loss that is not due to dieting or exercise,frequent bacterial or viral infections,headaches,skin rash,nonspecific bone pain,easy bruising,bleeding from gums or nose,blood in urine or stools,enlarged lymph nodes or spleen and abdominal fullness.

The presence of leukemia can be determinate only by doctors through blood tests and examinations of bone marrow.It is known that leukemia occurs in males more often than in females and in white people more often than in black people, but it is unknown the cause of leukemia and why this appears to a person, and to another one.

The several types of leukemia are grouped in two ways, the one depends on how quickly the disease develops and gets worse, and the other is the type of the blood cells affected.Leukemia can be: acute or chronic, lymphocytic or myelogenous.

In the case of acute leukemia abnormal blood cells remain very immature and cannot carry out their normal functions;for this reason the disease increase rapidly.Acute leukemia may present different types.There are some blast cells in chronic leukemia which are generally mature and they can carry out some of their normal functions.

A buildup of certain kinds of white blood cells allows themselves a long term.The number of blasts is smaller than in acute leukemia,so chronic leukemia worsens step by step.Lymphocytic and myelogenous deals with two different types of cells from which leukemias start.Lymphocytes are developped in the bone marrow which are lymphocytic leukemias.The myelocytic leukemia develops from either granulocyte white blood cells or monocyte white blood cells.

Leukemia means "white blood" and occurs when there is an excess of abnormal white blood cells in the blood.