How does epidural anesthesia work?

An epidural anesthesia, or epidural block, is a medical procedure involving the injection of a local anesthetic into the space outside the dura mater of the spinal cord in the lower back region.12

It is important to clarify that an epidural anesthesia is a controlled medical intervention for pain management, which is distinct from an epidural hematoma—a serious, life-threatening condition involving bleeding between the skull and the dura mater caused by trauma.3

In the context of labor or surgery, an epidural works by producing a loss of sensation, particularly in the abdomen or pelvic region. Common anesthetics used for this purpose include bupivacaine and lidocaine. When a catheter is utilized, medical professionals can modify the dose, volume, and type of anesthetic to suit the specific stage of labor or the requirements of a procedure, such as a cesarean delivery. While effective for pain relief, the procedure may be associated with side effects such as lowered maternal blood pressure or urinary retention.12