Low back pain with sciatica: symptoms, causes, evaluation

Low back pain is pain in the lower part of the back. It is called sciatica when the pain also spreads into the buttock and down the leg, sometimes as far as the foot. Sciatica is not a disease in itself: it is a symptom that one of the lumbar or sacral nerve roots that form the sciatic nerve is irritated or compressed.

Telling local back pain apart from pain that comes from a nerve matters, because it changes what the exam looks at and which options make sense. Not all pain that reaches the leg is sciatica: some muscle or joint problems are also felt in the thigh, although they usually behave differently.

The most common signs are:

• Pain that radiates from the low back or buttock down the back or side of the leg, usually on one side.
• Sharp, burning, or electric-shock pain that may be stronger in the leg than in the back.
• Tingling, pins and needles, or numbness in the leg or foot.
• Weakness in the leg or foot, such as difficulty walking on your toes or heels.
• Pain that increases with prolonged sitting, coughing, sneezing, or lifting.

Where the pain and tingling travel helps point to which nerve root is involved. That is why it helps to describe in detail how far the symptoms reach and which positions make them worse or better.

The most frequent cause is a disc herniation or protrusion pressing on a nerve root. Other common causes are narrowing of the spinal canal or the nerve openings from wear (stenosis), one vertebra shifting over another (spondylolisthesis), and, less often, other conditions that need medical workup.

Factors that make it more likely:

• Age: natural wear of the discs and spinal joints becomes more common over the years.
• Inactivity: low physical activity is associated with less strength and endurance in the muscles that support the spine.
• Physical overload: lifting with poor technique, repetitive loads, or sudden twisting movements.
• Long hours of sitting or driving, which may contribute in some people.
• Smoking and excess weight, which are associated with a higher risk of disc problems.
• Previous episodes of sciatica or known spine problems, such as a disc herniation or a narrowed spinal canal.

For many people, an episode of sciatica improves gradually over a matter of weeks. Staying active within what the pain allows is usually preferable to prolonged bed rest. If symptoms persist, keep coming back, or limit work and sleep, an evaluation is worthwhile.

Conservative care may include therapeutic exercise, physical therapy, guidance on posture and activity, and table decompression when the case allows. These options are weighed case by case; they do not replace surgery when it is indicated, and when the exam warrants it, referral to a physician or another specialist is recommended.

The spine evaluation includes your history, an orthopedic and neurological exam (strength, sensation, and reflexes), and a review of imaging if you bring it. An MRI is not always needed at the start; it is considered when there are red flags, a neurological deficit, or symptoms that do not improve. With that information, the findings are explained and a plan is proposed. The plan is set in the visit, with no promise of results from the first session.

• Pain into the buttock or leg that does not improve within a few days.
• Tingling, numbness, or mild leg or foot weakness that is not getting worse (if weakness is worsening, go to urgent care).
• Pain that limits work, sleep, or daily activity.
• Recurring episodes, or recent imaging you want reviewed in the visit.

If back pain comes with fever, unexplained weight loss, or a history of cancer, seek medical attention promptly.

Do not book here for loss of bladder or bowel control, numbness in the genital or anal area, leg weakness that is getting worse, or pain after a major injury. That is an emergency.