Why was the Spanish Flu known as the Spanish Flu? What caused the Spanish Flu? Where did the Spanish Flu come from? Why was it known as the 'Spanish Flu?' The Spanish Flu did not originate in Spain, although news insurance of it did. At some point of global warfare, Spain was an impartial united state with an unfastened media that covered the outbreak from the start, first reporting on it in Madrid in late 1918. In the meantime, Allied countries...