Cauda Equina Syndrome: the warning signs you should never ignore
Back pain is common, and most of the time it is nothing to panic about. But there is one rare condition we always want people to know about: Cauda Equina Syndrome (CES). It affects the nerves at the bottom of the spinal cord, which help control the bladder, bowel, legs and sexual function, so it needs urgent medical assessment.
The good news is that knowing the warning signs can help you spot when back pain needs immediate attention rather than a “wait and see” approach.
So, what exactly is Cauda Equina Syndrome?
At the lower end of the spinal cord sits a bundle of nerves called the cauda equina. The name means “horse’s tail” in Latin which, when you see what the nerves look like, makes perfect sense.
These nerves travel from the lower spine into the pelvis and legs, and they have some pretty important jobs. They help control:
- Bladder and bowel function
- Sexual function
- Movement and strength in the legs
- Sensation in the legs and lower body
- Sensation around the buttocks and genital area
Cauda Equina Syndrome happens when this bundle of nerves becomes significantly compressed or squeezed.
What can cause it?
The most common cause is a large prolapsed or herniated disc in the lower back. In simple terms, a disc can bulge or rupture and press on the nerves inside the spinal canal.
There are other, less common causes too, including narrowing of the spinal canal, bleeding, infection, inflammation or a tumour.
What symptoms should you look out for?
Symptoms are not always the same from one person to the next, but there are a few red flags that should always be taken seriously.
Bladder changes
This might include:
- Difficulty starting to pass urine
- Difficulty knowing when your bladder is full
- Being unable to pass urine
- Loss of bladder control
Bowel changes
You may notice a change from your normal bowel function, such as difficulty controlling a bowel movement or reduced sensation.
Numbness around the “saddle” area
One of the most important warning signs is new numbness or altered sensation around the buttocks, genitals, inner thighs or anus.
You may hear this described as “saddle numbness”, because it affects the area of the body that would touch a saddle.
Leg weakness
New or worsening weakness can develop in one or both legs, sometimes making it harder to stand or walk.
Changes in sexual function
CES can also cause changes to sexual sensation or function.
When is it time to get urgent help?
This is the bit we really want you to remember: Cauda Equina Syndrome is a medical emergency. If the nerves stay compressed, there is a risk of permanent nerve damage.
If you have significant back or leg pain and then develop new difficulty passing urine, loss of bladder or bowel control, numbness around the genitals or anus, or significant new weakness in the legs, seek urgent medical assessment.
Please do not wait for symptoms to become severe or hope they will settle on their own. It is always better to be assessed promptly.
Can it be treated?
Treatment will depend on what is causing the compression and how severe it is. If CES is confirmed, urgent treatment may be needed to relieve pressure on the nerves.
The aim is simple: to prevent further damage and give the affected nerves the best possible chance of recovering.
So, what is the key message?
Most people with back pain do not have Cauda Equina Syndrome, so there is no need to assume the worst. But because missing it can have serious consequences, knowing the warning signs really matters.
New bladder or bowel problems, numbness around the saddle area, or significant new weakness in the legs should never be ignored.
If you experience any of these symptoms, seek urgent medical attention rather than waiting to see if they improve.