Sciatica vs. back pain: how do they differ?

The term back pain can be used to describe a range of symptoms that occur from muscle strain or injury to the bone structures or nerves along the spine, whereas sciatica is a very specific type of pain radiating from the longest nerve in the body, the sciatica nerve, which is distinctively felt in the leg or foot and usually occurs on one side of the body.

Here, leading neurosurgeon Mrs Anne Mitchener explains the difference between sciatica and back pain and the long-term options for when it comes to treating sciatica at home.

What is sciatica?


Sciatica is a pain in the leg due to an abnormality of the sciatic nerve at a point along its course as it leaves the spine and travels to the foot. Most commonly, the cause is pressure on the nerve at the point that it leaves the spinal canal due to pressure from a disc herniation, or bony overgrowth, or a spur called an osteophyte.

The pain of sciatica is felt down the posterior aspect of the leg and into the sole of the foot. 
Commonly the term sciatica is used to mean pain from any of the spinal nerves supplying the leg such as the femoral nerve, which gives rise to pain in a different distribution. 


 

How does it compare to back pain?


 Back pain is in exactly that location in the back, not in the leg which is peripheral nerve pain often called sciatica. 


How can I tell the difference between both? (Is there a test I can do at home?)


Back pain is often complicated by pain in the leg from one of the nerves being pinched in the back but supplying the leg. If there is discomfort in the lower back, central or unilateral, and this is accompanied by leg symptoms, such as pain in the leg, numbness, pins and needles or weakness, then the origin of the symptoms is likely the lower back. The cause is most likely degenerative or wear and tear change in the tissues, usually the vertebral disc.

To test this at home you could lie on your back and ask a friend to raise the painful leg in the air to 90 degrees. This will likely cause leg pain if the cause is in the lower back. Alternatively, stand and try to bend forwards to touch the floor to test the symptom.

 

What if the symptoms are extreme? Could it be Cauda Equina?


The symptoms of Cauda Equina classically include low back pain, bilateral leg pain, disturbance of urine flow with incontinence and similarly incontinence of the bowel. Also, there is numbness in the groin or sitting region known as the saddle area.

If Cauda Equina syndrome is suspected, however, it is important to seek specialist medical assessment immediately. The condition is rarely straightforward to diagnose and requires a scan. It is not however common.

 

How can I manage sciatica at home?


Sciatica can be managed at home with simple analgesia, the warmth of a bath and a hot water bottle against the back. Some people find ice or TENS machines helpful. Walking or lying down is easier on the symptoms than sitting or standing. The opinion of a GP and physiotherapist is recommended.

 

What are the long-term solutions for treating sciatica?


If the pain persists and there is a need to treat, the options are medication from your GP, physical therapy, injection treatment as a day-case in a hospital, or surgery if supported by clinical examination and scan.
 

Mrs Mitchener is an expert in back, neck, arm and leg pain. You can book an appointment to visit her in the clinic via her Top Doctor's profile here.