My friend has been sick for the last two weeks. She has been throwing up everything she eats and she doesn't know why. Now she is super skinny (use to weigh 150 and now is 100) she lost 50 pounds in two weeks and isn't eating because she will just throw it up .I'm really worried for her what could it be ?

How old is your friend?

She is 16

You or she or both together need to talk with her parents about this. She is a minor and under their health insurance. She definitely must be seen by a doctor and her medical/weight loss/eating history noted.