It usually starts in the lower back or the buttock, then travels. Down the back of the thigh, past the knee, sometimes into the calf and foot. It can burn, it can feel electric, and it tends to arrive after something unremarkable: lifting a bag of compost, turning awkwardly in the car, or getting out of bed one Tuesday morning.
Sciatica is one of the most common reasons adults in their 50s, 60s and 70s end up in a GP surgery, and one of the most misunderstood. The story most people are told, that a disc has “gone” for good, is largely wrong. Most sciatica settles, and what you do in the first few weeks makes a real difference.
TL;DR
- Sciatica is a symptom, not a diagnosis: irritation of the sciatic nerve roots in the lower back, usually from a disc bulge or age-related narrowing of the spinal canal.
- Most cases improve substantially within six to twelve weeks without surgery, and staying gently active speeds recovery more than resting does.
- Red flags, particularly saddle numbness, loss of bladder or bowel control, or weakness in both legs, need same-day emergency assessment for possible cauda equina syndrome.
- Early MRI scans rarely change treatment and often show age-related changes present in pain-free people too.
- In Ireland, your GP is the entry point to HSE community physiotherapy and musculoskeletal triage clinics, with medical card and Drug Payment Scheme supports for medication costs.
What sciatica actually is
The sciatic nerve is the largest in the body, formed from nerve roots that exit the spine in the lower back and run down through the buttock and leg. Sciatica is pain following that pathway: a description, not a diagnosis. The cause sits in the spine, not in the leg where you feel it.
Two causes dominate after 50. The first is a disc prolapse, where the softer inner material of a disc pushes outward and irritates a nerve root, both by pressure and by triggering inflammation. The second, more typical from the mid-60s onward, is lumbar spinal stenosis: gradual narrowing of the canal the nerves travel through, caused by thickened ligaments, arthritic facet joints and disc height loss. Stenosis has a tell. Pain and heaviness build when you walk or stand and ease when you sit or lean forward over a trolley, so people notice they can manage a supermarket shop but not a flat walk of the same length.
When to seek help urgently
Most sciatica is not dangerous, but a small number of presentations are genuine emergencies. Go to an emergency department the same day, without waiting for a GP appointment, if you develop:
- Numbness or altered sensation around the genitals, inner thighs or back passage, the area a saddle would touch
- Difficulty passing urine, loss of the sensation that tells you your bladder is full, or new incontinence of urine or bowel
- Sciatica affecting both legs at once, or rapidly worsening weakness such as a foot that drags or gives way
- Severe pain alongside fever, unexplained weight loss, or a history of cancer
These can indicate cauda equina syndrome, where the timing of treatment genuinely matters. Far better to be assessed and reassured than to wait and hope.
What the evidence says about recovery
Acute sciatica has a favourable natural history. Most people improve significantly within six to twelve weeks, and disc prolapses shrink on their own as the body reabsorbs the material. Worth holding onto during the worst week, when it does not feel remotely plausible.
Two findings tend to surprise people. First, bed rest does not help: studies comparing rest with gentle activity find no benefit to lying up, and some evidence of slower recovery. Second, scans. Imaging of adults with no back pain at all finds disc bulges in most people over 60, described in alarming language. An early MRI seldom changes what is recommended, which is why guidelines reserve it for red flags, symptoms past six weeks, or those considering surgery or injections.
What helps in the first six weeks
Keep moving within limits. Short, frequent walks beat one long effort, and changing position often beats holding any single one. If sitting is the aggravator, stand and move every twenty minutes.
Use pain relief so that you can stay active, rather than as an end in itself. Paracetamol and anti-inflammatories help some people, though anti-inflammatories need caution with kidney disease, heart failure, high blood pressure or a history of stomach ulcers, and your pharmacist can check them against your other medicines. Gabapentin and pregabalin are sometimes prescribed, but the evidence in sciatica is weaker than many expect, and drowsiness and unsteadiness matter more as we age, given the falls risk.
Heat often eases the muscle guarding that comes with nerve pain, and for sleep, lying on your side with a pillow between the knees takes tension off the lower back. Physiotherapy is the mainstay if things are not settling: a physiotherapist will look at how you move, give you graded exercise rather than generic stretches, and help rebuild confidence, which is often the piece that lags behind the pain.
Getting support in Ireland
Start with your GP, who can assess, rule out red flags, advise on medication and refer onward. With a medical card, GP visits and prescriptions are covered bar a small charge per item. Without one, the Drug Payment Scheme caps what a household pays for approved prescribed medicines each month, worth registering for if you are on several.
The HSE provides community physiotherapy through Primary Care Centres by GP referral, though waiting times vary considerably around the country. Many hospitals now run musculoskeletal physiotherapy triage clinics, where an advanced practice physiotherapist assesses spinal referrals instead of a long wait for orthopaedics, and can order imaging or refer for injections. Privately, the Irish Society of Chartered Physiotherapists keeps a directory of registered practitioners, and “chartered physiotherapist” is the term to look for. Most health insurance policies cover a set number of sessions a year.
Injections and surgery
For pain persisting beyond six to eight weeks despite good conservative treatment, epidural steroid injections can give short-term relief, buying time for rehabilitation. Surgery, usually a microdiscectomy for disc prolapse or a decompression for stenosis, is considered when leg pain stays severe and disabling, when there is significant nerve weakness, or when someone has had enough after months of trying. It relieves leg pain faster than waiting, though by one to two years the two groups’ outcomes converge for many.
Reducing the chance it returns
Recurrence is common, and the things that reduce it are unglamorous: regular walking, strength work for the hips, trunk and legs two or three times a week, keeping weight in a healthy range, not smoking, and sorting the ergonomics of wherever you sit longest. Sciatica also responds badly to fear. People who avoid activity while waiting to feel fully better usually do worse than those who resume gradually while still a bit sore.
If you are in a flare-up now, be patient with the timeline and firm about the red flags. At Críonna Health we write about ageing well with the evidence in one hand and real Irish services in the other, because knowing what helps is only half of it. Knowing who to ring is the other half.
General information, not individual medical advice. If you are worried about new or worsening symptoms, contact your GP.
📷 Photo by Vitaly Gariev on Unsplash
