A herniated disk refers to a problem with one of the rubbery cushions (disks) that sit between the individual bones (vertebrae) that stack to make your spine.
A spinal disk has a soft, jellylike center (nucleus) encased in a tougher, rubbery exterior (annulus). Sometimes called a slipped disk or a ruptured disk, a herniated disk occurs when some of the nucleus pushes out through a tear in the annulus.
A herniated disk, which can occur in any part of the spine, can irritate a nearby nerve. Depending on where the herniated disk is, it can result in pain, numbness or weakness in an arm or leg.
Many people have no symptoms from a herniated disk. Surgery is usually not necessary to relieve the problem.
Most herniated disks occur in the lower back, although they can also occur in the neck. Signs and symptoms depend on where the disk is situated and whether the disk is pressing on a nerve. They usually affect one side of the body.
Arm or leg pain. If your herniated disk is in your lower back, you'll typically feel the most pain in your buttocks, thigh and calf. You might have pain in part of the foot, as well. If your herniated disk is in your neck, you'll typically feel the most pain in your shoulder and arm. This pain might shoot into your arm or leg when you cough, sneeze or move into certain positions. Pain is often described as sharp or burning.
Numbness or tingling. People who have a herniated disk often have radiating numbness or tingling in the body part served by the affected nerves.
Weakness. Muscles served by the affected nerves tend to weaken. This can cause you to stumble, or affect your ability to lift or hold items.
Disk herniation is most often the result of a gradual, aging-related wear and tear called disk degeneration. As you age, your disks become less flexible and more prone to tearing or rupturing with even a minor strain or twist.
Most people can't pinpoint the cause of their herniated disk. Sometimes, using your back muscles instead of your leg and thigh muscles to lift heavy objects can lead to a herniated disk, as can twisting and turning while lifting. Rarely, a traumatic event such as a fall or a blow to the back is the cause.
Factors that can increase your risk of a herniated disk include:
Weight: Excess body weight causes extra stress on the disks in your lower back.
Occupation: People with physically demanding jobs have a greater risk of back problems. Repetitive lifting, pulling, pushing, bending sideways and twisting also can increase your risk of a herniated disk.
Genetics Some people inherit a predisposition to developing a herniated disk.
Smoking It's thought that smoking lessens the oxygen supply to the disk, causing it to break down more quickly.