Types of anesthesia
Epidural vs Spinal Anesthesia
They sound similar and they're often confused — both numb you from the waist down and let you stay awake. The main difference is simple: a spinal is one quick injection that wears off in a few hours, while an epidural is a thin tube that can keep working for hours or even days.
The difference in one line
Side-by-side comparison
| Spinal | Epidural | |
|---|---|---|
| How it's given | Single injection into the fluid around the spinal cord (intrathecal) | Thin catheter placed in the epidural space, just outside the fluid |
| Onset | Fast — works within minutes | Slower — builds up more gradually |
| Density of block | Dense and complete numbness | Can be lighter or denser depending on the dose used |
| Duration | A few hours, then wears off | Can be extended for hours or even days |
| Catheter left in? | Usually no — it's a one-shot | Yes — a fine tube stays so it can be topped up |
| Typical uses | C-sections, lower-limb orthopaedics, TURP, hernia repair | Labour pain relief, ongoing pain relief after surgery |
| Headache risk | Post-dural-puncture headache slightly more associated — but uncommon | Lower; uncommon overall |
| Blood-pressure drop | Common and expected — managed by the team | Common and expected — managed by the team |
Spinal anesthesia
A spinal is a single injection of local anesthetic into the fluid that surrounds the spinal cord. Because the medicine goes right where it works, the numbness is fast, dense and complete — and it wears off over a few hours. There's usually no catheter left behind; it's a one-shot technique. That predictability makes it a great fit for operations of a known length, like C-sections, lower-limb orthopaedic surgery, TURP and hernia repair.
Epidural anesthesia
An epidural delivers local anesthetic through a thin catheter placed into the epidural space — just outside the fluid. The onset is a little slower, but the big advantage is flexibility: it can be topped up or run continuously for hours or even days. That's why it's the go-to for labour pain and pain relief after an operation. Sometimes a spinal and an epidural are combined (a CSE) to get the best of both — a fast start plus ongoing control.
Important
So which one will I have?
That depends on your operation, how long it's expected to take, and whether you'll need pain relief that continues afterwards. Both are safe, routine and used every day. Your anesthetist chooses the approach that fits your surgery — and they'll explain it to you beforehand.
Frequently asked questions
What is the difference between an epidural and a spinal?
A spinal is a single injection of local anesthetic into the fluid around the spinal cord, giving fast, dense numbness that wears off in a few hours. An epidural places a thin catheter just outside that fluid, so the local anesthetic works a little more slowly but can be topped up or run continuously for hours or days. Both numb the lower body and let you stay awake.
Which is stronger, a spinal or an epidural?
A spinal usually gives a faster and denser (more complete) block because the local anesthetic is placed directly into the spinal fluid. An epidural builds up a little more gradually but has the advantage that it can be kept topped up for as long as it's needed.
How long does a spinal anesthetic last?
A spinal is typically a single shot that wears off over a few hours, which suits operations with a predictable length. An epidural can be extended through its catheter, which is why it's used for labour and for pain relief that needs to continue after surgery.
Are epidurals and spinals safe?
Yes. Both are safe, routine techniques used every day. Common, expected effects include a temporary drop in blood pressure (which the team manages), and there's a small risk of a post-procedure headache — slightly more associated with spinals but still uncommon. Your anesthetist will go through the specifics for you.
Can you have both an epidural and a spinal together?
Yes. A combined spinal-epidural (CSE) gives the fast, dense onset of a spinal plus the top-up flexibility of an epidural catheter. It's used in situations like labour and some surgeries where both quick relief and ongoing control are helpful.