hi from www. healthgrades. com come this answer. a low wbc count is often linked to problems with the bone marrow and the inability to make enough white blood cells. autoimmune diseases that attack your white blood cells can also lead to a low wbc count. several different prescribed drugs including chemotherapy are known to decrease wbc production or destroy wbcs. hope this helps you. good luck
my wbc dropped from 4. 6 to 3. 4 in 4 months. what are possible causes? . i'm 70 y/o male in good health. ride a bike 15-20 miles a day. all other blood work normal. no fever or fatigue. thanks.