Sciatica Pain

The sciatic nerve starts in the lower back at lumbar segment 3 (L3).

It is a large nerve that starts in the lower back. It forms near the spine and is made up from branches of the roots of the lumbar spinal nerves. It travels through the pelvis and then deep into each buttock. It then travels down each leg. It is the longest and widest single nerve in the body.

                               

Sciatica is not a diagnosis but a description of symptoms. Anything that places pressure on one or more of the lumbar nerve roots can cause pain in parts or all of the sciatic nerve. A herniated disk, spinal stenosis, degenerative disc disease, spondylolisthesis, or other abnormalities of vertebrae can all cause pressure on the sciatic nerve.

Some cases of sciatica pain may occur when a muscle located deep in the buttocks pinches the sciatic nerve. This muscle is called the piriformis. The resulting condition is called piriformis syndrome.

At each level of the lower spine a nerve root exits from the inside of the spine and then comes together to make up the large sciatic nerve. Portions of the sciatic nerve then branch out in each leg to innervate certain parts of the leg - e.g. the buttock, thigh, calf, foot, toes

Pressure on the sciatic nerve can have many causes, some serious and some more minor. Sciatica may be the result of something as simple as bad posture, muscle strain or spasm, pregnancy, being overweight, wearing high heels, or sleeping on a mattress that is too soft. More seriously, it can result from pressure exerted on the sciatic nerve or its nerve roots by a slipped disc in the back.

You may be at increased risk of sciatica if you have a job that involves heavy lifting, twisting your back, or sitting for lengthy periods of time. Age and diabetes also contribute to the risk. As you age, the discs in your back begin to deteriorate. Diabetes can increase the risk of nerve damage.

In some cases, sciatica is due to nerve inflammation caused by a form of arthritis, or is caused by the squeezing of the sciatic nerve by a tumour wrapped around the spinal cord in the lower back (the lumbar spine).

The spinal cord is a soft bundle of nerves that starts at the base of the brain and runs down the middle of the back. It is the main pathway for communication between the brain and the rest of the body. The cord is covered by the protective spinal column (the vertebrae). Nerves enter and exit the spinal cord all the way down its length, passing through small openings between each vertebra. Nerve roots also stick out through these openings, exchanging nerve signals with the rest of the body.

The vertebrae are separated from each other by discs made of cartilage, a substance like bone but softer. Each disc has a tough outside layer and a soft inside part that acts as a shock absorber, cushioning the vertebrae when the body moves around. If the disc is damaged by injury or through aging, the inner part can bulge or slip through the outer layer. The "extruded" or "herniated" inner part of the disc may then compress or inflame a nerve root sticking out between two adjacent vertebrae. The disc may even injure the nerve root. If this happens in the lower back area, it leads to pain travelling down the sciatic nerve in the leg.

                               

Osteoarthritis is another common source of nerve root damage that may cause sciatica. Osteoarthritis is characterized by the formation of bone spurs (bits of protruding bone) that may press on the nerve roots. Sometimes, older people may also develop a condition called spinal stenosis, where the space around the spinal cord narrows and squeezes nerves. More rarely, infections like meningitis or spinal cord tumours can affect the nerves. It's also possible for the sciatic nerve to be compressed further outside the spinal column in the pelvis or buttocks.

Do not opt for surgery until all efforts are exhausted. Contact us and discuss. May be we can help.

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