CAUSE+Leukemia+Sujin+and+Siao+En


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**Causes of Leukemia:** **There are five cases that can cause Leukemia. __Genetic factor__ is one of them. If one of your realatives have Leukemia, there would be higher risk of getting Leukemia. Also, chromosome damage can cause Leukemia such as people with downs syndrome can more likely to have Leukemia than other people.** 

[|www.st-andrews.ac.uk/ news/Title,22990,en.html] || __  [] What is the most uncommon factor that causes leukemia?
 * [[image:http://www.st-andrews.ac.uk/media/Bryant%20Chromosomes%20310708.jpg width="370" height="267" caption="Human Chromosomes under the microscope.Human blood-cell chromosomes with damage (shown by arrows) caused by low-dose radiation.The number of these 'breaks' is increased in exposed blood cells from breast cancer cases."]] ||
 * damaged chromosomes
 * __Enviromental Factor__ can also cause Leukemia. Exposure to herbicides, smoking and exposure to radiation can likely to cause leukemia. **
 * Viral Infection** __ **can also cause Leukemia but this case is very rare. one of the example is that animals can infect human Leukemia virus. People with __immune deficiency__ can also cuase Leukemia** ** since the immune system is not good enough to resist the foreign cell it can cause leukemia. Lastly, __chemicals__ such as carcinogen can also cause Leukemia by damaging **  **the cells.**