Lower back pain may start suddenly, then spread to the buttock and down the leg, lasting for weeks without clear improvement. In many cases, the reason is pressure or irritation of the sciatic nerve — a condition known as sciatica.
But what causes this pressure? And what are the most common causes of sciatica? In this article, we explore the main causes and risk factors in detail.
The Most Common Causes of Sciatica
Herniated Disc
This is the most common cause. It occurs when a spinal disc between the vertebrae presses on the sciatic nerve roots, leading to pain that radiates from the lower back down the leg.
Spinal Stenosis
With aging, the spinal canal through which nerves pass may narrow, causing chronic pressure on the sciatic nerve.
Piriformis Muscle Spasm
Inflammation or tightness of the piriformis muscle in the buttock can compress the sciatic nerve, a condition known as piriformis syndrome.
Direct Lower Back Injury
Accidents, falls, or improper heavy lifting can injure the vertebrae or discs, resulting in nerve compression.
Prolonged Sitting
Extended sitting, especially with poor posture, increases pressure on the lumbar spine and may gradually irritate the sciatic nerve.
Obesity and Excess Weight
Excess body weight places additional stress on the spine, increasing the likelihood of disc-related problems.
Pregnancy
During pregnancy, hormonal changes and weight gain increase pressure on the lower back, which may lead to sciatica symptoms.
Risk Factors That Increase the Likelihood of Sciatica
Aging
Physically demanding jobs
Weak abdominal and back muscles
Lack of physical activity
Diabetes
Can Sciatica Be Prevented?
In many cases, the risk of sciatica can be reduced by adopting healthy habits that support the spine and decrease nerve pressure.
Preventive measures include strengthening back and core muscles regularly, avoiding prolonged sitting without movement, using proper lifting techniques, and maintaining a healthy weight to reduce stress on the lumbar spine.
Regular moderate physical activity also improves flexibility and spinal support, reducing the likelihood of sciatic nerve compression.
When Should You Be Concerned?
If leg pain is accompanied by severe weakness, loss of sensation, or loss of bladder or bowel control, immediate medical attention is required. These symptoms may indicate serious nerve compression needing urgent care.
When Do You Need a Specialist Evaluation?
If leg pain recurs frequently or interferes with daily activities, it may be advisable to undergo a specialized evaluation to determine the exact cause of nerve pressure before the condition worsens.
Early diagnosis helps select the appropriate treatment and prevents progression to more complex stages.
Conclusion
Sciatica has multiple causes, but the common factor is pressure on the sciatic nerve. Herniated discs, spinal stenosis, injuries, and a sedentary lifestyle are among the most frequent triggers.
Early diagnosis and accurate identification of the cause are essential for choosing the right treatment and preventing complications, especially if the pain affects your daily life.
