Causes

Experts say that different leukemias have different causes. The following are either known causes, or strongly suspected causes:
- Artifical ionizing radiation
- Viruses
- Chemotherapy agents used in previous cancer treatments
- Maternal fetal transmission (rare)
- Hair dyes
- Genetic Predispostion- some studies researching family history and looking at twins have    
  indicated that some people have a higher risk of developing leukemia because of a single 
  gene or multiple genes.
- Electromagnetic energy- studies indicate there is not enough evidence to show that ELF 
  magnetic (not electric) fields that exist currently might cause leukemia. The IARC (International Agency for Research on Cancer) says that studies which indicate there is risk tend to be biased and unreliable.