We report 3 cases of congenital diaphragmatic hernia (CDH) in the second decade of life which were misdiagnosed on initial presentation. The first case had an iatrogenic gastric injury because of intercostal tube drainage for suspected pleural effusion. The second case was treated for pulmonary tuberculosis for 6 months before being diagnosed as a case of CDH. The third case presented as acute chest pain on the left side. It was treated accordingly for 1 month and was diagnosed as a CDH on a CT scan of the chest when seen by a surgeon.