Nerve blocks, or neural blockades, are procedures that can help prevent or manage
many different types of pain. They are often injections of medicines that block pain
from specific nerves. They can be used for pain relief as well as total loss of feeling
if needed for surgery.
Perhaps the best-known nerve block is an epidural. Many pregnant women ask for an
epidural during childbirth to ease the pain of labor and delivery. In an epidural,
doctors inject an anesthetic drug into the space just outside the spinal column.
About nerve blocks
Nerve blocks require needles, often along with a fluoroscope, ultrasound, or CT scan
to properly guide the needle. The health care provider may also use low level electrical
stimulation to locate the nerve causing pain. The needles and guided images are used
to inject pain-relieving or anti-inflammatory drugs around a nerve or group of nerves.
This numbs the area and/or relieves inflammation. Sometimes chemicals or surgery is
used to actually intentionally damage or cut the nerve. Nerve blocks halt the pain
messages coming from the nerves in a particular part of the body.
Types of nerve blocks
Nerve blocks can be temporary or longer-lasting. Health care providers may give them
with local anesthesia after numbing where the needle enters the skin. They can also
block pain signals to an area by deliberately cutting or destroying certain nerves
These are types of surgical nerve blocks:
Sympathetic blockade. The health care provider gives a drug to block pain from the sympathetic nervous
system in 1 particular area.
Neurectomy. A damaged peripheral nerve is surgically destroyed.
Rhizotomy. The surgeon destroys the root of the nerves that extend from the spine.
These are types of nonsurgical nerve blocks:
Epidural analgesia or anesthesia. The health care provider may inject medicine outside the spinal cord.
Spinal anesthesia or analgesia. The health care provider may inject medicine in the fluid surrounding the spinal
Peripheral nerve blockade. The health care provider may inject medicine around a target nerve causing pain.
Benefits of nerve blocks
Nerve blocks can be used to manage chronic, or long-term, pain, pain after surgery, severe
acute, or short-term, pain. Nerve blocks ease pain by offering immediate relief. They
can also offer longer-term relief, because some injections reduce irritation to the
nerves and let them heal.
Nerve blocks can help people who have chronic pain function better in their daily
lives, allowing them to go to work, exercise, and do daily tasks.
Temporary nerve blocks are often a short-term fix. The pain may return within as little
as a few hours after the drugs wear off. Some people may need repeated or even long-term
nerve block treatments to manage inflammation and pain.
Common uses for nerve blocks
Nerve blocks are often used during surgeries to ease pain. They may also be used to
manage the pain of chronic health conditions or injuries in which the nerves are damaged,
inflamed, or irritated.
Nerve blocks are commonly used to manage pain that comes from the spine, as well as
debilitating pain that affects the arms, legs, neck, and buttocks.
Click to Enlarge: Example of epidural insertion
You and your health care provider may discuss a nerve block to manage these types
Labor and delivery pain
Pain after surgery
Severe facial pain, like trigeminal neuralgia
Low back pain
Headaches, including migraines and occipital neuralgia
Chronic regional pain syndrome, or CRPS
Other uses for nerve blocks
Health care providers may use a nerve block as a tool to find out what is causing
your pain and where it is coming from. By judging how you react to a temporary nerve
block and how it affects your pain, your health care provider can better figure out
the reason for your pain, where it is located, and how to best treat it.
Risks of nerve blocks
Like all procedures, nerve blocks carry some risks. A nerve block can lead to bleeding
and infection where the shot was given, the medicine may spill into other areas unexpectedly,
and health care providers may hit the wrong nerve during surgery. Compared with many
procedures, however, nerve blocks appear to be quite safe.