Not just their rhymes are sick...
Kid Cudi has struggled with depression and has openly spoken out about it and about awareness. He has talked publicly about his battle with depression and hopes that by showing that it is okay, he can help raise awareness.
Chief Keef has been rumored to suffer from Asperger Syndrome. This is a social anxiety illness that makes it difficult for those suffering from it to interact with people.
Lil Scrappy was hospitalized in 2012 for a severe asthma seizure. Scrappy has suffered from asthma for some time now and does not leave home without his breathing machine.