What problems were there during the trench warfare?

Answer 1

The biggest problem outside of those generally associated with war. Was a fungal infection dubbed "Trenchrot". This occurs when a foot is left in a wet sock and shoe for prolonged periods of time. If left untreated the foot will begin to rot and have to be amputated. By that time however it was just as likely the soldier could get sepsis and die outright.

Moving supplies and communication from the rear lines was also difficult. To get supplies close enough you had to pass over the previous battlefields until you got to an entrance. This meant dealing with unexploded ordinance and miles of barbwire. It also became and issue as you got close to the trench as you were exposed and often in range of sniper fire.

Answer 2

It was a bloody, disorganized stalemate that didn't go very far. The only thing you could do was run in a certain direction and hope you didn't get killed. Unfortunately, most did. If somehow you took a trench, reinforcements from both sides would come in and flush you out in one direction or the other.

Answer 3

High amounts of shooting, low food and supplies, poision gas, tanks, and the constant threat of the enemy advancing across No Mans Land into your trench.