A spinal tap (lumbar puncture) is not the same as an epidural.
For a start- spinal taps on paediatric patients are sometimes done without local anaesthetic.
If you are the sort of person who finds more information helpful, I’ll describe in detail the process of epidural/spinal anaestheia. If you find things like that make you more scared, feel free to skip over the rest of this post.
With epidural and spinal blocks the only needle you feel as sharp is the first one, used for the local anaesthetic. It is the same type of needle as the ones used to take a blood sample or give vaccinations, not a bigger one, and won’t feel any worse just because it is your back.
It will feel sharp and the local might sting (think of the local anaesthetic at the dentist), but only for a few seconds.
Then they wait until the skin and tissue is numb before inserting the spinal needle.
The spinal needle is longer (length of your finger, not knitting needle length), but is finer than the first needle, and you don’t feel it as pain or sharpness, just as pressure- like someone pressing hard on a small spot on your back.
Then, once the needle is in the right spot they either inject the anaesthetic and take the needle out (a spinal- like I had, which lasts for only a couple of hours, works immediately and can’t be topped up- ideal for planned c-sections), or they inject the drugs and leave a tiny tube in place (an epidural, which lasts longer, takes 10-20minutes to kick in fully, but can be topped up- ideal for labour). Spinals and epidurals are sited in slightly different places (within vs around) the spinal cord, which accounts for their differences.
You then have a weird warm feeling in your legs and backside, and before you know it your legs seem to belong to someone else entirely. I wasn’t particularly fond of that aspect- being temporarily paralysed is a bit freaky, but not horrible and I knew it would happen, which helped.
Spinals give denser pain relief and more paralysis than epidurals- some people with light epidurals can move around throughout their labours. I couldn’t even wiggle my toes while the spinal was working.
Because of the blood/brain (which, in this case includes the spinal cord) barrier the drugs used to provide maternal pain relief this way have less of an effect on the baby than drugs inhaled, ingested or injected by the mother.
I won’t link to them here, but you can Google images and videos of epidurals and spinals if you want to see the process (and the needles)…or not, if you don’t.
If you’re still reading, I hope that helped.