The symptoms of the Spanish flu were: extreme fatigue, fever, and headaches. Some victims would start turning blue, while others would become incontinent. It would also cause muscle and joint pain, and lack of appetite.
Over 70,000 American troops were hospitalized and nearly one third of these men died from failed recovery. German militaries found it impossible to replace their sick and dying
soldiers. The virus weakened soldiers, and if the Spanish flu had not come along the war might have ended differently.