Final answer:
The common side effect of epidural anesthesia during labor is decreased sensation in the lower body, which is a result of the blockade of nerve impulses in the lower spine.
Step-by-step explanation:
A common side effect of epidural anesthesia in labor is c) Decreased sensation in the lower body. During labor, hormones such as oxytocin play a crucial role in the process through a positive feedback mechanism. Factors such as the fetus stretching the cervix signal the brain to release oxytocin, which causes uterine contractions. It's important to note that epidural anesthesia is designed to block the nerve impulses in the lower spine, which results in decreased sensation and pain relief in the lower body, while typically not increasing blood pressure, respiratory rate, or uterine contractions directly.