Rats and Lice were common in the trenches, soldiers would often findlice in their uniform.
As a result of lots of rats and lice, disease would spreadveryquickly.
Soldiers had to live in crampedquarters with littleprivacy or personalspace.
The trenches had verypoordrainagesystems which would result in flooding.
Soldiers would developtrenchfoot after standing in cold, dirty and wetconditions for longperiods of time. In the worstcases they would have to get their footamputated.