A pain that starts in your lower back, travels through the buttock and down the thigh and leg, sometimes reaching the foot and toes — burning or electric-shock-like rather than an ordinary muscle ache, and worse when you cough, sneeze or sit for long stretches. That is the classic description of sciatica. This article explains what sciatica actually is, its symptoms, its causes — with herniated disc at the top of the list — how it is diagnosed, what the treatment options are, and when the pain becomes a warning sign that needs urgent medical assessment.
What Is Sciatica?
Sciatica is not a disease in itself. It is a set of symptoms caused by irritation of, or pressure on, the sciatic nerve — the largest nerve in the body. It is formed from nerve roots that leave the lumbar and sacral vertebrae in the lower spine, then passes behind the pelvis and buttock and runs down the back of the leg to the foot.
Because the nerve follows such a long path, pressure on it at the level of the lower spine is felt as pain in the buttock, thigh and leg. This is why many people assume the problem is in the leg itself, when its real source is the spine.
Symptoms of Sciatica
Symptoms vary from person to person depending on where the nerve is compressed and how severely, but the most common are:
- Pain radiating from the lower back to the buttock and down the leg, often reaching the foot and toes
- Sharp or burning pain that feels like an electric shock, distinctly different from ordinary muscle pain
- Numbness or pins and needles in the leg, foot or toes
- Weakness in the leg muscles, or a sense that the leg feels heavy and uncooperative
- Pain that worsens with coughing or sneezing, prolonged sitting, or certain movements
- Symptoms usually affect one side of the body
An important point: not every back pain is sciatica. The distinguishing feature is pain that travels along the nerve path down into the leg, rather than staying localised in the lower back.
Sciatica vs. Ordinary Lower Back Pain
Common lower back pain tends to be localised, accompanied by stiffness and difficulty moving, and improves with gentle activity and better posture. Sciatica is different: the pain travels, moving from the back into the buttock and leg, and is usually accompanied by numbness or weakness. It is this nerve-pattern radiation that prompts a doctor to look for something compressing a nerve root, instead of treating the case as a simple muscle strain.
What Causes Sciatica?
1. Lumbar Disc Herniation — The Most Common Cause
Between every two vertebrae sits a disc that acts as a shock-absorbing cushion. When the outer layer of that disc tears and part of its inner content pushes outwards, it can press on the neighbouring nerve root, and pain begins to radiate along the sciatic nerve. This is the single most common cause of sciatica, and it usually occurs in the lumbar region of the lower back — what most people simply call a "slipped disc".
2. Spinal Stenosis
With age, the canal through which the nerves pass inside the spine can narrow because of changes in the vertebrae and ligaments, leaving less room for the nerve roots and causing compression. This cause is more common in older adults, and the pain often worsens with standing or walking and eases on sitting or bending forward.
3. Spondylolisthesis
When one vertebra slips slightly forward over the one beneath it, the opening through which the nerve root exits can narrow, producing sciatica symptoms.
4. Piriformis Syndrome
The piriformis is a deep muscle in the buttock that the sciatic nerve runs alongside. Spasm, inflammation or injury of this muscle can irritate the nerve and produce pain resembling sciatica, even though the source lies outside the spine.
5. Pregnancy
During pregnancy the ligaments become more relaxed, pelvic posture changes, and the load on the pelvis increases — all of which can translate into pressure on the sciatic nerve and pain radiating down the leg. Symptoms here are usually temporary, but they deserve assessment if they are severe or accompanied by weakness.
6. Less Common Causes
These include direct injuries to the lower back or pelvis after an accident or fall, as well as rarer causes such as masses or tumours within the spinal canal, or inflammatory and blood collections pressing on the nerves. These are uncommon, but they must be ruled out when worrying signs are present.
Risk Factors
Several factors raise your likelihood of developing sciatica, and most of them relate to lifestyle:
- Ageing, with the accompanying changes in spinal discs and joints
- Excess weight, which increases the load carried by the lower back
- Occupational demands: lifting heavy objects incorrectly, frequent bending, or sitting for long hours at a screen or behind the wheel
- Physical inactivity and weak back and abdominal muscles
- Diabetes, because of its potential effect on the nerves
- Smoking, which affects disc nutrition and accelerates disc wear
How Sciatica Is Diagnosed
Diagnosis always begins with the clinical examination, not with imaging. Your doctor will ask precisely where the pain travels, when it started, and what makes it better or worse, then perform a neurological examination that may include:
- The straight leg raise test: the doctor lifts your leg while you lie down to see whether the movement reproduces the radiating pain
- Assessment of muscle power, sensation and reflexes in the legs, to identify which nerve root is affected
- MRI: not required in every case from the outset, but it is the most precise study when symptoms persist without improvement or when there are clear neurological signs
- X-ray: to rule out fractures or assess vertebral changes
- Nerve conduction studies: in selected cases, to determine how far the nerve is affected
At Town Hospital in New Cairo, the orthopaedic and spine team assesses your case starting from the clinical examination, then decides whether you genuinely need imaging, so the treatment plan is built on the real cause of the pain rather than on the symptoms alone.
Treatment of Sciatica
The reassuring news is that most cases improve without surgery, and treatment always starts with the simplest, least invasive options.
Conservative Treatment — The First Choice
- Staying as active as possible: prolonged complete bed rest does not help recovery; it is better to continue your usual activities to the extent the pain allows
- Physiotherapy and rehabilitation: supervised, targeted exercises to strengthen the back, abdominal and pelvic muscles and improve flexibility — the cornerstone of treatment
- Hot or cold packs over the painful area, whichever gives you more relief
- Medication determined by your doctor, such as painkillers, anti-inflammatories or muscle relaxants — the choice and duration are strictly medical decisions and should never be self-prescribed
- Posture correction when sitting, standing and lifting, with short frequent breaks if your work is desk-based
- Targeted injections around the nerve: used by the doctor in some cases to reduce inflammation around the nerve root so rehabilitation can begin
When Is Surgery Considered?
Surgery is not the first option, and most patients never need it. Your doctor will usually discuss it in situations such as:
- Pain that persists without improvement despite adequate conservative treatment
- Clear or progressive muscle weakness in the leg or foot
- Severe pain that disrupts daily life, sleep and work
- Signs of severe nerve compression requiring urgent intervention
The type of procedure depends on the cause: removing the portion of disc pressing on the nerve, or widening the space through which the nerve passes.
Preventing Sciatica
Not every case can be prevented, but you can substantially lower your risk and reduce the chance of a recurrence after recovery:
- Exercise regularly, including core-strengthening work for the abdominal and back muscles
- Lift heavy objects by bending your knees, keeping your back straight and the load close to your body
- Avoid sitting for hours on end; stand up and move for a few minutes roughly every half hour
- Set up your chair and desk so your back is supported and your feet rest flat on the floor
- Maintain a healthy weight to reduce the load on your lower back
- Stop smoking
When to See a Doctor
Most cases of sciatica improve gradually over a few weeks to a few months with home care and regular movement. But some situations cannot wait:
Book an appointment with an orthopaedic or spine doctor if:
- The pain has not improved after several weeks of home care
- The pain is getting worse over time rather than easing
- The pain is stopping you doing your normal activities or affecting your sleep
- Numbness or tingling in the leg or foot persists, or episodes keep recurring
⚠️ Go to the emergency department immediately — or call an ambulance (123 in Egypt) — if you develop any of the following:
- Pain or numbness in both legs, not just one
- Severe or worsening weakness in the legs, or genuine difficulty walking
- Numbness around the inner thighs, genitals or anus
- Loss of bladder or bowel control, or inability to pass urine
- Severe back pain after an accident or fall, or pain with fever or unexplained weight loss
These signs may indicate severe compression of the bundle of nerves at the bottom of the spine (known as cauda equina syndrome), an emergency in which the sooner treatment happens, the better the outcome.
Frequently Asked Questions
What is the difference between sciatica and a herniated disc?
A herniated disc is an anatomical condition: part of a spinal disc has pushed out of position. Sciatica is the set of symptoms produced by pressure on the sciatic nerve — the pain that radiates from the back down the leg. A herniated disc is the most common cause of sciatica, but not the only one; spinal stenosis and spondylolisthesis can produce it too.
How long does sciatica take to heal?
Most cases improve over a few weeks to a few months with regular movement, physiotherapy and adherence to medical advice, while some take longer. The timeline depends on what is compressing the nerve, how severely, and how consistent you are with your rehabilitation programme.
Is sciatica dangerous — can it cause paralysis?
The overwhelming majority of cases are not dangerous and resolve without lasting complications. However, severe or sustained pressure on the nerves can leave long-term weakness or numbness in a small number of cases, which is why progressive muscle weakness and any of the warning signs above should never be ignored — early intervention is what protects nerve function.
Can sciatica be treated without surgery?
Yes, and most patients do improve with conservative care: staying active, physiotherapy, medication determined by a doctor, and sometimes targeted injections. Surgery is reserved for specific situations, such as failure of conservative treatment or clear neurological deficit.
Does prolonged sitting make sciatica worse?
Yes. Sitting for long periods — especially in a poor position — increases the load on the lower back and often intensifies the pain. Try to stand up and move for a few minutes roughly every half hour, and adjust the height of your chair and screen.
Medical note: This article is for health awareness only and is not a substitute for direct medical diagnosis or consultation. If your symptoms persist or affect your daily life, please see a specialist.