Excruciating pain in the back during labor. It occurs when the fetus is in a posterior presentation, with the back of its head pressing again the mother's spine.

Labor when most of the pain is in the mother's back. Often caused by a posterior presentation baby rubbing on the mother's spine during labor.

The position of the baby (head directed to the mother's back) that causes extreme back discomfort and pressure during labor, occurring in one fourth of all labors.