Why Does My Back Hurt? The Most Common Causes and What to Do About Them

Back pain is one of the most searched health questions in Australia, and for good reason. At some point, almost everyone ends up typing some version of it into Google at 10pm, wondering whether what they're feeling is serious or something that will sort itself out.

The honest answer is: it depends on what's causing it. Back pain is not one thing. It's a symptom that can come from a dozen different structures — muscles, joints, discs, nerves — and the treatment that helps one cause won't necessarily help another. So rather than a generic "see a doctor and rest up," here's a practical breakdown of the most common reasons backs hurt, and what each one usually means for recovery.

Muscle strain and soft tissue pain

This is the most common cause of back pain by a significant margin, and it's also the most misunderstood. People tend to catastrophise it, assuming any back pain must mean a disc problem or structural damage, but most of the time, the pain is coming from overloaded or irritated muscles and connective tissue.

It usually comes on after lifting something awkwardly, a long stint of sitting, a sudden change in activity, or sometimes for no obvious reason at all. The pain is typically dull, widespread, and gets worse with certain movements. It can be surprisingly sharp in the moment but tends to ease with gentle movement once the initial flare settles.

The good news is that most muscle-related back pain resolves within a few weeks. Seeking an assessment from a Physiotherapist or Osteopath can help determine the cause and give you advice and treatment on how to reduce pain and get you back to the things you love doing.

Disc irritation and sciatica

The lumbar discs sit between the vertebrae in your lower back and act as shock absorbers. When they're under pressure or sustain a tear, they can bulge or herniate, and if that protrusion contacts a nearby nerve root, you get what most people know as sciatica.

Sciatica is often described as a shooting, burning, or electric pain that travels from the lower back into the buttock and down the leg, sometimes as far as the foot. It can also cause tingling (check this blog out on pins and needles in the legs), numbness, or weakness in the leg. The back pain itself might actually be secondary to the leg symptoms, or it might be absent altogether.

Not all disc issues cause sciatica. Some people have disc changes that cause local back pain without any leg involvement. The distinction matters because it changes what treatment is likely to help. Also, some people have disc issues that cause no pain or lower back symptoms. Often, an MRI is ordered when disc irritation is suspected; it is important to have a trust health care practitioner to explain the scan as we know that what we see on a scan and the clinical picture has to match to get the treatment right.

Most disc-related back pain does improve with the right management. The timeline is longer than muscle pain, sometimes several months, but the prognosis for most people is genuinely positive.

Facet joint pain

The facet joints are the small joints at the back of the spine that allow you to bend and twist. Like any joint, they can become stiff, inflamed, or arthritic over time. Facet joint pain tends to be felt as a deep ache across the lower back, often worse first thing in the morning, after long periods of sitting, or when bending backwards.

It's more common in people over 40, but it's not exclusively an older person's problem. Poor movement habits, prolonged postures, and previous injuries can all contribute earlier. Physiotherapy or Osteopathy treatment focused on joint mobility, posture, and strengthening may help with a facet strain.

Sacroiliac joint dysfunction

The sacroiliac (SI) joint connects the base of the spine to the pelvis. It doesn't move much, but when it's irritated through pregnancy, a fall, or a change in load, it can produce significant one-sided lower back and buttock pain that's often mistaken for a disc or hip problem.

SI joint pain typically produces a sharp or aching pain low in the back, often on one side, that can refer into the groin or down the back of the thigh. It's often aggravated by standing on one leg, climbing stairs, or rolling over in bed.

Postural and movement-related pain

This is the category that desk workers, drivers, and anyone who spends most of their day in a fixed position. When the body is held in the same position for hours particularly in a slumped or forward-flexed posture certain muscles fatigue and tighten, and the structures around the spine are placed under sustained, low-grade load.

The pain this produces is usually an aching heaviness across the mid or lower back that builds through the day and eases when you move around. It's common, genuinely uncomfortable, and easy to dismiss as just part of working life. It's also one of the most straightforward presentations to address, because the driver is mechanical and largely modifiable.

Exercise physiology has a real role here alongside physiotherapy & osteopathy- building the strength and endurance that supports better posture under load, rather than just managing symptoms as they arise.

When to stop Googling and get help urgently

Most back pain doesn't require emergency attention, but there are symptoms that should prompt you to see a doctor or go to the emergency deparment rather than book a physio or osteo session:

Inability to control your bladder or bowel, numbness in the groin or inner thighs, sudden severe weakness in both legs, or back pain accompanied by unexplained weight loss or fever. These are rare, but important to know about.

What to actually do about back pain

For most people, the most useful thing isn't rest it's understanding what's actually happening and staying appropriately active while it settles. Prolonged bed rest consistently makes outcomes worse, not better.

A physiotherapy or osteopathy assessment can identify which structure is driving the pain, rule out anything that needs further investigation, and give you a clear plan for getting it under control. The plan often includes hands on treatment, exercise prescription and strengthening work- no one plan is the same as everyone needs to looked at as an invididual.

Back pain is common. It's also usually very manageable once you understand what you're dealing with.

If your back pain sounds musculoskeletal, find your nearest Move Beyond clinic and book an assessment with one of our physiotherapists or osteopaths.