What were the illnesses during World War 1?

During World War I, soldiers faced a range of illnesses, including trench fever, caused by lice; influenza, which led to the devastating 1918 pandemic; and pneumonia. Additionally, many suffered from shell shock, now recognized as PTSD, due to the psychological trauma of warfare. malaria and dysentery also affected troops, particularly in tropical regions. The unsanitary conditions in trenches further exacerbated the spread of Infectious Diseases.