1) Childbirth term 
Back labor (less commonly called posterior labor) is a term referring to sensations of pain or discomfort that occur in the lower back, just above the tailbone, to a mother during childbirth. Back labor may be noted when the baby is face up in the birth canal (occiput posterior), and not face down, so that the back of the baby`s skull (occiput) i....
Excruciating pain in the back during labor
A moderately common condition in which labor pains are felt in the lower back during childbirth, making a vaginal delivery more painful. The excrutiating pain occurs when the fetus is in a posterior presentation, with the back of its head pressing against the cervix of the laboring woman.
Contractions primarily felt in the mother's lower back; sometimes caused when the baby is facing the mother's front
Pain of labor felt in lower back.
Pain of labor felt in lower back.
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.