白血球低会引起抵抗力下降，容易得传染性疾病

一般原因是：

A low white blood cell count usually is caused by one of the following:

• Viral infections that temporarily disrupt bone marrow function 病毒感染暂时影响骨髓造血机能
• Congenital disorders characterized by diminished bone marrow function先天性骨髓功能异常
• Cancer or other diseases that damage bone marrow 癌症或其他疾病损伤了骨髓
• Autoimmune disorders that destroy white blood cells or bone marrow cells自体免疫性疾病攻击白血球或骨髓
• Overwhelming infections that use up white blood cells faster than they can be produced大规模感染大量消耗白血球
• Drugs that destroy white blood cells or damage bone marrow药物杀伤白血球或损伤骨髓

Specific causes of low white blood cell count include:特殊原因有

• Aplastic anemia 先天再生障碍贫血
  
• Certain medications, such as antibiotics and diuretics 某些药物的影响，例如抗生素和利尿剂
• Chemotherapy化疗
• HIV/AIDS艾滋病毒感染
• Hypersplenism, a premature destruction of blood cells by the spleen脾功能亢进
• Infectious diseases细菌感染
• Kostmann's syndrome, a congenital disorder involving low neutrophil production先天性中性粒细胞减少症
• Leukemia白血病
• Lupus红斑狼疮
• Malnutrition营养不良
• Myelodysplastic syndromes 骨髓增生异常综合症
  
• Myelokathexis, a congenital disorder involving failure of neutrophils to enter the bloodstream 先天性骨髓粒细胞减少症
• Other autoimmune disorders 其他自体免疫异常
• Other congenital disorders 其他先天性疾病
• Parasitic diseases 寄生虫病
• Radiation therapy 放疗
• Vitamin deficiencies 维生素缺乏