Low Back Pain
“We did not find a cause” is not the same as “nothing is wrong”
General information from an emergency physician. It adds to your discharge papers and does not replace them or your own doctor. What this site is and isn’t
Key Takeaways:
- Four different parts of your lower back can cause pain. No scan or exam can point at which one it is. That is what “nonspecific” means. It does not mean the pain is not real.
- Moving is the treatment. Bed rest makes it worse. The tightening that feels protective is what keeps the pain going.
- See your own doctor in the next 1 to 2 weeks. If you are not clearly better in 2 to 6 weeks, that is the signal to start a real exercise program. It is not a signal to get another scan.
About Your Diagnosis and ED Workup
Four parts of your lower back can each cause pain: the muscles beside your spine, the ligaments, the discs between the bones, and the small joints at the back of the spine. All four have nerves in them.
Here is the part that matters. There is no test, and no scan, that can tell which one of those four is causing your pain. That is why you may have been told the pain is “nonspecific.” The word means one thing only: a source has not been found, not that there is nothing there.
Why there was no indication to scan your back. Every major guideline recommends against routine imaging for new nonspecific low back pain, and a review of 6 randomized trials confirmed imaging does not improve how patients do. Scans find something in almost everyone: 96% of people aged 80 with no pain at all have worn discs, and 64% of people with no symptoms have at least one disc abnormality on MRI. So the scan almost always finds something. Then that normal, age-related finding gets blamed for the pain, and that drives anxiety, more testing, and treatment that does not help.
Not scanning is not the same as excluding everything. Your emergency visit looked for the specific warning signs of a serious cause. Those warning signs are usually not subtle, so when they are absent, that absence genuinely means something. The list is below, because things can change at home.
First Steps and Evidence-Based Home Care
Keep moving. Walking is the one to lead with. Staying active beats bed rest for both pain and function, and is linked to about 4.5 fewer days off work. Bed rest is strongly not recommended. It delays recovery and it feeds the fear.
Why it works. Pain makes the muscles beside your spine tighten on their own. That sustained tightening then becomes a source of pain itself, and it cuts the muscle’s own blood supply. Short term, it protects. Kept up, it turns harmful. This is the reason behind every instruction to keep moving. A modest increase in pain when you move does not mean you are doing damage.
Use heat. It gives a moderate improvement in both pain and function.
Pain medicine helps less than most people expect. None of it is a cure. At best it takes the edge off so you can keep moving. Follow your discharge paperwork, and know two things either way: do not use anti-inflammatories like ibuprofen or naproxen if you have kidney disease, or if you have had stomach bleeding or an ulcer. Muscle relaxers make people sleepy, and in older adults that sleepiness raises the risk of a fall. Opioids and sedatives are not recommended for this.
If the pain runs down your leg: movements that pull the pain up toward your back are reasonable and safe to keep doing. Any movement that pushes the pain further down your leg is one to stop.
Timeline and Expected Recovery Course
Most of this gets better on its own.
| When | Where most people are |
|---|---|
| Day 1 | Average pain 56 out of 100 |
| 2 to 3 weeks | About half of people recovered with good first-line care |
| 6 weeks | Average pain 26 out of 100, more than cut in half |
| 12 months | About 72% recovered |
Those numbers come from a review of 60 studies, following 17,974 people from the start of their pain.
Being honest about the rest of the picture. About 70% of people follow a recovery path. But up to about 40% still have some symptoms past 3 months, and about 30% have another episode within the year.
If your pain runs down your leg, most of it settles without any specific treatment. In one study, 87% of patients taking only oral pain medicine had less pain by 3 months. Expect your pain to improve long before a scan would show any change. A repeat scan at 6 weeks showing an unchanged disc is normal. It is not evidence that you were misled.
Emergency: Come Back to the ER Now
Return to the emergency department if any of these happen:
- Sudden loss of control of your bladder. Sudden loss of control of your bowel. Sudden numbness in your groin, or between your legs, or where you would sit on a saddle. These can mean the nerves at the bottom of your spine are being squeezed. That is an emergency.
- Leg weakness that is severe, or that is getting worse, especially in both legs. Weakness that is getting worse means come back, not more stretching.
- A fever along with the back pain. This raises concern for an infection in the spine. That concern is higher if you also use IV drugs, take medicine that lowers your immune system, or have a catheter in place.
- Unexplained weight loss, or new back pain if you have a history of cancer.
- A significant new injury, or even a minor one if you have thin bones (osteoporosis), take steroids, or are 75 or older. And belly pain along with the back pain, especially in an older man who smokes.
This list does not cover everything. If something about your back pain worries you, return to the emergency department.
Reviewed August 27, 2026