Why people hair fall in cancer?

What happens in cancer? 

And why people's hair falls? 

In the cancer, some cells of the body begin to distribute without any control. This causes such drugs to be given such as chemotherapy. Effect the celles, where our head hair (Hair Follicle) is also distributed very fast.

Cancer patient 

Therefore, the medicine also has an effect on them, which causes the hair to fall, thus slowly falling all the hair. Some patients even cut all the hair once to avoid falling hair - so people with cancer are bald.