If an eating disorder is not treated, anorexia or bulimia can cause the following health problems:

* Stomach problems
* Heart problems
* Kidney problems
* Dental problems (from throwing up stomach acid)
* Dehydration (not enough water in the body)
* Irregular periods or no periods
* Fine hair all over the body, including the face
* Dry, scaly skin

Are you asking this question for yourself or a friend? You can find more information here:

http://familydoctor.org/online/famdocen/ho me/children/teens/eating/277.printerview.h tml

Basically, all the organs can be affected and start malfunctioning. Even your skin and hair will be harmed.