We report a case of Bochdalek Hernia of diaphragm in an adult with acute onset of chest pain and breathlessness. The presence of bowel sounds in the left hemithorax and findings of a herniated stomach into the left hemithorax through a ruptured left diaphragm on chest roentgenogram were diagnostic. A CT scan examination suggested a large sized hernia and established the contents of the hernia. Nasogastric tube aspiration immediately relieved symptoms and an early surgery was curative