Leukemia is a type of cancer which originates in blood-forming tissue usually found in the bone marrow and the lymphatic system and is part of the broad group of diseases called hematological neoplasms. It results in overproduction of abnormal white blood cells (leukocytes), which are not fully developed, hence being called blasts of leukemia cells, they are located in the part of the immune system which defends the human body against diseases and infections. As platelets, or white blood cell multiplies at a fast rate inside the tissue in the bone marrow not serving any specific function (carrying oxygen,or fighting off infection), resulting in minimum space in order for healthy cells to form, fewer white and red blood cells (platelets) are released into the blood preventing clotting and damage our immune system. As white blood cells are potent infection fighters, due to your body’s needs, they grow and divide in an orderly way, which is then disrupted as abnormal white blood cells prohibit their functionality. This leads in various symptoms related to the immune system, such as susceptibility of infections, fever, and tiredness. Due to the lack of oxygen to the brain (originating from red blood cells), the patient often experiences fatigue, paleness, and a higher rate in breathing. Prolonged bleeding is causes as a decrease in platelets production leading to lack of blood clots present. Various different leukemias are classified according to the predominant type of white cell involved as well as the course of the disease.Acute Leukemia, being the most common form of Leukemia in children, is classified by the rapid increase in quantity of immature blood cells, which prevents the bone marrow to produce any form of healthy red and white blood cells, affecting myeloid cells. The rapid accumulation and production of malignant cells cause it to overflow into the bloodstream, having easy access towards other organs in the body, being fatal within weeks or months if left untreated.Chronic Leukemia on the other hand, is characterised by the excessive production of abnormal, but relatively mature white blood cells, being produced at a much more frequent rate than normal. However, resulting in many abnormal white blood cells, Chronic Leukemia progresses at a slower pace, typically taking months or years to progress, meaning that they are normally monitored for some time before treatment, in order to insure highest levels of effectiveness.