White blood cells have to maintain a given amount in the body, any increase or decrease will cause the human boy act abnormally against the infections. Leukopenia is the disorder where the number of white blood cells decreases (Lymphocytes) in the human body. This disorder make the human body vulnerable to infections as the ability to combat against the infection depends on the number of white blood cells in the body.

White blood cells are the crucial players of immune system. To kill and digest the harmful substance, white blood cells should receive the message about the entrance of harmful substance in the body. To kill the organism an equate number of white blood cells are used. White blood cells are produces in bone marrow like other blood cells, however they go though a whole process to get mature. Neutrophils, Lymphocytes, Monocytes, Eosinophils, and Basophils are the five types and steps in the life cycle of the white blood cells.

There are several causes for white blood cell disorders. However malaria, influenza, typhus, dengue and Rickettsial infections are the main causes of white blood cells disorders. If any infection is not cured for a longer period of time, it weakens the white blood position in the composition of blood, which may even cause death.

Certain deficiencies in certain substances required for the development of white blood cells can cause white blood cells disorders. Mainly Neutrophils and Lymphocytes are the two types of the white blood cells causing white blood cell disorders. Neutrophils are the type of white blood cells that fight against bacteria and destroy it. Any decrease in the number Neutrophils will cause serious illness. They last for about eight hours, therefore they have to be produced and retained by the body consistently. Increase in the number of white blood cell the will occur with the abnormal release of white blood cells in the blood. This will interrupt the human body function and will create disorders.

In absence of white blood cells anemia, bleeding and infection are the major disorder that may arise. Without adequate number of white blood cells the body loses its ability to fight against the infection or injury. Which eventually results into anemia in that sitation patient bleeds for hours after the injury. This may causes internal bleeding to the patient, which can be fatal for him.