The bones (vertebrae) that form the spine in your back are cushioned by small, spongy discs. When these discs are healthy, they act as shock absorbers for the spine and keep the spine flexible. But when a disc is damaged, it may bulge or break open. This is called a herniated disc. It may also be called a slipped or ruptured disc.
You can have a herniated disc in any part of your spine. But most herniated discs affect the lower back (lumbar spine). Some happen in the neck (cervical spine) and, more rarely, in the upper back (thoracic spine). This topic focuses mainly on the lower back.
What causes a herniated disc?
It may be caused by:
When a herniated disc presses on nerve roots, it can cause pain, numbness, and weakness in the area of the body where the nerve travels. A herniated disc in the lower back can cause pain and numbness in the buttock and down the leg. This is called sciatica (say “sy-AT-ih-kuh”). Sciatica is the most common symptom of a herniated disc in the low back.
If a herniated disc is not pressing on a nerve, you may have a backache or no pain at all.
If you have weakness or numbness in both legs, along with loss of bladder or bowel control, seek medical care right away. This could be a sign of a rare but serious problem called cauda equina syndrome.
How is a herniated disc diagnosed?
Your doctor may diagnose a herniated disc by asking questions about your symptoms and examining you. If your symptoms clearly point to a herniated disc, you may not need tests.
Sometimes a doctor will do tests such as an MRI or a CT scan to confirm a herniated disc or rule out other health problems.
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