In the inner city, a health problem is making it harder for young people to learn. The Centers for Disease Control said 30 percent of inner city kids suffer from post-traumatic stress disorder (PTSD). The CDC said these children often live in virtual war zones. Doctors at Harvard said they actually suffer from a more complex form of PTSD that some call “hood disease.” Unlike soldiers, children in the inner city never leave the combat zone. They often experience trauma, repeatedly.