Low white blood cell count means that a person's body is fighting off an infectious disease. It can also indicate the presence of serious health problems such as leukaemia, aplastic anaemia and hyperthyroidism. This condition occurs when one is taking certain medications which lower white blood cell production.
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A low white blood cell count indicates the presence of illness. It can be a viral infection such as flu and glandular fever or a much serious one like leukaemia, hyperthyroidism as well as aplastic anaemia.