The Spanish Influenza, which is also referred to as the Spanish Flu, was a lethal pandemic that spread across the world in 1918. This 10-month pandemic led to the deaths of an estimated 22 to 40 million people according to Navy Department Library records. The physical effects of the Spanish Influenza--though similar to those of the seasonal flu---were quite severe and typically affected young, healthy adults.
Fever
Abnormally high fever was a severe physical effect of the Spanish Influenza. The immune system of the body uses fever to prevent viruses and bacteria from multiplying and spreading throughout the body. Prolonged fever can lead to a number of additional cognitive complications including confusion, delirium or difficulties with speech or fine motor skills. In children, high fever may cause loss of consciousness and uncontrollable shaking of the body---a medical condition called a febrile seizure. High fever may also lead to extreme fatigue, fainting or coma in certain people.
Stomach Upset
The Spanish Influenza caused severe stomach upset to occur in certain people. Extended episodes of nausea, vomiting or diarrhea were common in people with this infection. Stomach upset may also lead to decreased appetite and significant weight loss. If the level of nutrients ingested by the body is decreased, the body may not have sufficient energy to fight off infection. Decreased food intake can also cause dehydration, which may lead to the development of additional symptoms such as headache, dizziness or fainting.
Respiratory Difficulties
People infected by the Spanish Influenza often developed severe respiratory difficulties as a result of this condition. An article published by National Public Radio (NPR) noted that may patients with Spanish Influenza would suffocate due to lack of oxygen caused by the accumulation of fluid within the lungs. Some people may experience wheezing or coughing as a consequence of respiratory complications associated with the Spanish Influenza. These respiratory difficulties also led to the development of severe pneumonia in certain people. Pneumonia is a lung infection that can cause sweating, chills, chest pain, headache, fever, cough or shortness of breath.
