Sciatica, Nerve Pain, Radiculopathy – What Actually Is What?

Tingling in the leg, a pulling pain down into the calf, numbness in the foot – these complaints can be intense and unsettling. And when terms like sciatica, nerve root irritation, or radiculopathy are thrown around, things can get even more confusing. What does it all mean? And what does it tell us about how serious the situation really is?

This article explains the most important terms – not for specialists, but for people who want to understand what is happening in their body.

Referred Pain

Referred pain occurs when irritated tissue – such as a disc or a facet joint – generates pain signals that the brain attributes to a different region of the body. This happens because nerve fibres from different areas of the body enter the spinal cord at the same levels, where their signals converge – making it difficult for the brain to always clearly distinguish their exact origin (Chen et al., 2023).

The result: the pain is felt somewhere other than where the problem actually lies. Referred pain typically feels dull, deep, and hard to pinpoint – often in the gluteal region or the thigh. It is frequently labelled "sciatica," even though the nerve itself is not directly involved.

Radicular Pain

Radicular pain is true nerve pain. It occurs when the nerve root itself – the point where the nerve exits the spine – is irritated or inflamed and begins sending uncontrolled electrical impulses that should not be originating there (Bogduk, 2009). This happens most commonly with a herniated disc pressing on the nerve root.

This type of pain feels completely different from referred pain: sharp, shooting, often intense. It is frequently accompanied by tingling, numbness, or a burning sensation. The pain typically radiates into the leg – but not always in the clearly defined stripe one might imagine. Research shows that the exact distribution varies considerably and rarely follows the expected dermatomes of individual nerve roots in a predictable way (Albert et al., 2012; Furman & Johnson, 2019). What this means for you: if your pain doesn't look "typical," that tells us very little about whether a nerve is involved or not.

Radiculopathy

Radiculopathy does not describe pain – it describes a loss of function. The nerve root is transmitting signals less effectively, because it has been damaged by pressure or inflammation. This manifests as diminished reflexes, reduced sensation, or muscle weakness in the area supplied by that nerve.

Radicular pain and radiculopathy can occur simultaneously – but they don't have to. Sometimes the pain is severe while nerve function remains largely intact; sometimes it is the other way around.

And What About Sciatica?

"Sciatica" is not a precise medical term – it is more of an umbrella term for leg pain that is somehow related to the spine, whether that involves referred pain, radicular pain, or both. The term is old and imprecise. However, most people understand it, which is why it has its place in everyday language – as long as we recognise that it says nothing specific about the underlying cause.

What Nerve Pain Does Not Mean

Nerves have an undeserved bad reputation. Many people imagine that the slightest pressure on a nerve leads to permanent damage. That is not the case. Nerves are surrounded by a robust protective sheath – they are mobile, resilient, and, like any other body tissue, fundamentally capable of healing and recovering (Moseley & Butler, 2017; Jesson, 2018).

The term "trapped nerve" is also misleading. It conjures up an image of a dangerous, tight entrapment – in reality, even with significant spinal changes, there is usually still adequate space available. A more accurate description would be: the nerve is irritated or compressed (Moseley & Butler, 2017).

And what about the tingling, twitching, or burning? These sensations arise because an irritated nerve becomes hypersensitive and sends more signals to the brain than necessary – comparable to a smoke alarm going off from a little steam from the shower. It is unpleasant, but in most cases it does not mean that something is seriously damaged (Jesson, 2018).

When Immediate Medical Attention Is Required

Most nerve complaints follow a benign course and resolve over weeks to months. However, there are warning signs that should not be waited out. Seek emergency care immediately if you notice:

• New numbness or loss of sensation in the groin, buttocks, or inner thighs

• Sudden difficulty urinating – for example, being unable to pass urine or losing control of the stream

• Newly developed loss of bladder or bowel control

• Rapidly increasing weakness in one or both legs

These symptoms may indicate cauda equina syndrome – a rare but serious emergency in which a cluster of nerve roots in the lower spinal canal becomes severely compressed and requires prompt treatment to prevent permanent damage (Gesundheitsinformation.de, 2023; MSD Manual, 2025).

For all other cases: intense nerve symptoms – tingling, burning, radiating pain – are distressing, but they do not usually represent a dangerous situation. What a typical course of nerve pain looks like and what you can realistically expect will be covered in the next article.

If you are experiencing nerve-related complaints in Munich or Sendling and would like to know whether and how osteopathy can support you, we look forward to hearing from you.

References

Albert, H. B., Hauge, E., & Manniche, C. (2012). Centralization in patients with sciatica: Are pain responses to repeated movement and positioning associated with outcome or types of disc lesions? European Spine Journal, 21(4), 630–636. https://doi.org/10.1007/s00586-011-2018-9

Bogduk, N. (2009). On the definitions and physiology of back pain, referred pain, and radicular pain. Pain, 147(1–3), 17–19. https://doi.org/10.1016/j.pain.2009.08.020

Chen, X., Zhong, M., Yue, T., Guo, K., Jiang, X., Bi, Y., Zhao, C., Zhang, Y., Song, Y., & Liu, H. (2023). Referred pain: Characteristics, possible mechanisms, and clinical management. Frontiers in Neurology, 14, 1104817. https://doi.org/10.3389/fneur.2023.1104817

Furman, M. B., & Johnson, S. C. (2019). Induced lumbosacral radicular symptom referral patterns: A descriptive study. The Spine Journal, 19(1), 163–170. https://doi.org/10.1016/j.spinee.2018.05.029

Gesundheitsinformation.de. (2023). Was hilft bei Ischias-Schmerzen? Institut für Qualität und Wirtschaftlichkeit im Gesundheitswesen (IQWiG). https://www.gesundheitsinformation.de/was-hilft-bei-ischias-schmerzen.html

Jesson, T. (2018). Radiculopathy, radicular pain and referred pain: What are we really talking about? inTouch, 164, 16–21.

MSD Manual. (2025). Cauda-equina-Syndrom. MSD Sharp & Dohme GmbH. https://www.msdmanuals.com/de/heim/störungen-der-hirn-rückenmarks-und-nervenfunktion/erkrankungen-des-rückenmarks/kauda-syndrom

Moseley, G. L., & Butler, D. S. (2017). Explain Pain Supercharged. Noigroup Publications.