Lower Back Pain: Causes and Treatment in Canberra

A lot of people are surprised, and sometimes worried, when their lower back pain sits clearly on one side. In fact it is one of the most common patterns we see, and there is usually nothing mysterious about it. We simply do not use our backs symmetrically. We favour one hand, carry bags on one shoulder, sit twisted toward a screen, sleep in a preferred position and drive with one leg working the pedals, and over time that asymmetry loads one side more than the other. When something there becomes irritated, the pain naturally shows up on that side.

Most one-sided lower back pain traces back to a mechanical source on that side: an irritated facet joint, a strained or tight muscle, or the way the pelvis and hip on that side are moving. Left-sided and right-sided pain are equally common, and which side it is does not, on its own, signal anything specific about seriousness. What matters far more is how the pain behaves: whether it stays local, what eases or aggravates it, and crucially whether it travels anywhere. Our blog on one-sided lower back pain guide walks through the common patterns in more detail.

The main thing worth watching is whether one-sided back pain begins to refer down into the buttock and leg, or comes with numbness, pins and needles or weakness, because that shifts the picture toward possible nerve involvement, which we cover further down. Steady, one-sided lower back pain that stays in the back, without those leg symptoms, is usually a straightforward mechanical problem, and it tends to respond well to assessment and hands-on care aimed at the structures and movement patterns on that side.

Few things are as alarming as a lower back that suddenly seizes. One moment you are bending to pick something up or turning to reach behind you, and the next the muscles clamp down so hard you can barely move, sometimes leaving you stuck bent over or frozen in place. It can be intensely painful and genuinely frightening, and people often assume they have done something serious. Reassuringly, a muscle spasm itself is usually not a sign of damage; it is the body slamming on the brakes.

That is really what a spasm is: a protective reflex. When the back senses a threat, whether from a sudden strain, an irritated joint, an overloaded muscle or even just an awkward movement at the wrong moment, it can respond by locking the surrounding muscles rigid to guard the area. The problem is that the spasm itself then becomes a major source of pain, and the tightness can linger and feed on itself well after the original trigger. It is a well-meaning response that rather overdoes it.

The good news is that most acute spasms settle over a few days, particularly with the right approach: gentle movement within comfort rather than total rest, warmth, and calm reassurance, since fear and tension only wind the muscles tighter. Hands-on care can help ease the guarding and settle the joint or muscle that set it off, often speeding things along and, importantly, helping reduce the chance of it happening again. If spasms keep recurring, that is a signal to look for the underlying pattern driving them rather than just riding out each episode.

In the first day or two of a bad spasm, a few simple measures help most people. Keep gently mobile within whatever range is comfortable rather than lying rigid for hours, use heat to encourage the muscles to relax, and avoid the temptation to test the back with big, brave movements too soon. Simple over-the-counter pain relief, used sensibly and in line with the pharmacist's advice, can take enough of the edge off to let you keep moving, which is itself part of the recovery. If the grip has not started to ease within a few days, that is the point to have it assessed.

Most lower back pain stays in the lower back, but sometimes it does not, and that change in pattern is worth understanding. When pain begins to travel from the back down into the buttock and leg, particularly below the knee, or when it comes with numbness, pins and needles, or weakness in the leg or foot, it suggests a nerve may be involved rather than just muscles and joints. This is the territory of sciatica and disc-related problems, and it calls for a more careful look.

Sciatica is not itself a diagnosis so much as a description of that leg-travelling nerve pain, and it can stem from an irritated or bulging disc pressing on or inflaming a nerve, or from other structures narrowing the space a nerve passes through. It sounds frightening, and it can certainly be painful, but the majority of cases still settle with time and conservative care, and surgery is the exception rather than the rule. What matters is recognising the pattern and assessing it properly rather than treating it as ordinary back pain. You can read more on our dedicated sciatica treatment page.

Our role here is to assess carefully, including those neurological checks of reflexes, strength and sensation, to work out whether a nerve is genuinely involved and how significantly. In many cases we can help with conservative care, and where the picture calls for it, we will co-ordinate with your GP or refer you on for further investigation. The red flags mentioned across our back pain pages, such as loss of bladder or bowel control or rapidly progressing weakness, always take priority and need urgent medical attention rather than hands-on treatment.