In the section on "Experiences in a Concentration Camp," Frankl describes a physical condition that affected "nearly all the camp inmates." What was this condition? How did it affect Frankl?

Frankl writes that nearly everyone suffered from edema. He writes that this made his legs "so swollen and the skin on them so tightly stretched that I could scarcely bend my knees. I had to leave my shoes unlaced in order to make them fit my swollen feet." This made every step he took quite painful.