A spinal block is a type of regional analgesia that's typically used to provide pain relief shortly before delivery. A spinal block with a stronger medication — an anesthetic — is often used before a C-section. It can also be used if a vaginal birth requires the use of forceps or vacuum extraction. You'll be asked to sit or lie on your side during the procedure. The medication is injected into the sac of fluid below the spinal cord in the lower back and typically takes effect within minutes. A spinal block is commonly combined with an epidural block during labor.